Wednesday, March 6, 2013

Spam Appliance - Filter Or Block Unsolicited Mail Messages

The operation of the personal or business mailbox can be very difficult without a quality spam appliance to filter or block unsolicited mail messages. The very sorting of the valuable emails is a cumbersome task when the web user needs to work with bulk mail. Only with a spam blocker or filter coming between the mail server and the personal computer, will you be able to make your mail account optimal in terms of usage. While nobody escapes spam on the Internet, some users are more exposed than others. Anyone with an active email address knows how this works.

An anti spam appliance consists of a software program that identifies, isolates and deletes the emails with spamming features. Two categories of spam appliance can be identified: spam blockers and spam filters. And although the concepts are often used interchangeably, there are differences between the tools. With a filter, your mails will get organized in spam and not-spam categories. The PC user has to delete or answer the mails manually afterwards. You can skip the part with the deleting, by installing a spam appliance of the blocker type that automatically blocks and removes spam messages.

Major email services such as Yahoo! Mail or Google Gmail include spam filters which already allows for an appropriate selection of the messages, but the filtering settings can been easily fooled by lots of spammers. Therefore, if you are in great need of minimizing the spam mail, it is advisable to install a quality anti spam appliance so that you also reduce the risk of computer infection with viruses and all sorts of malevolent programs. Some tools are free while others cost a small fortune, it all depends on the features and the usage extent.

Spam Appliance - Filter Or Block Unsolicited Mail Messages

Do not buy a spam appliance without testing a trail version first. Most software companies allow for a free download for a 15 or 30 day trial period. If the software performance matches your needs, full protection can be achieved by registering. The prices for a good spam appliance can vary from to per month depending on the features. Corporations are the clients with the highest demand for protection and they are the first to purchase quality spam blockers in order to preserve the quality of their business transactions.

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Tuesday, February 26, 2013

Cyberethics (Information System Ethics)

In order to examine ethical issues, it is first necessary to define ethics. Today, we regard ethics as a "rational process founded on certain principles." However, I believe a definition that is more applicable to this project is the ethical theory that existed in ancient Greece. There, ethics was the study of what was good for both the individual and society. We will look at some online issues and how they may be good and/or bad for society. Cyberethics is quite simply the study of ethics on the Internet.
"Ethics begins when elements within a moral system conflict."
Cyberethics is often called as Information System Ethics. Information System ethics can be defined as "The study of moral, legal, ethical issues involving the use of information and communication technologies"
There are many unique challenges we face in this age of information. They stem from the nature of information itself. Information is the means through which the mind expands and increases its capacity to achieve its goals, often as the result of an input from another mind. Thus, information forms the intellectual capital from which human beings craft their lives and secure dignity.

However, the building of intellectual capital is vulnerable in many ways. For example, people's intellectual capital is impaired whenever they lose their personal information without being compensated for it, when they are precluded access to information which is of value to them, when they have revealed information they hold intimate, or when they find out that the information upon which their living depends is in error. The social contract among people in the information age must deal with these threats to human dignity. The ethical issues involved are many and varied in Information System Ethics.

Ethics is required in information Systems to overcome the following ethical issues.

Cyberethics (Information System Ethics)

Privacy: What information about one's self or one's associations must a person reveal to others, under what conditions and with what safeguards? What things can people keep to themselves and not be forced to reveal to others?

Accuracy: Who is responsible for the authenticity, fidelity and accuracy of information? Similarly, who is to be held accountable for errors in information and how is the injured party to be made whole?

Property: Who owns information? What are the just and fair prices for its exchange? Who owns the channels, especially the airways, through which information is transmitted? How should access to this scarce resource be allocated?

Accessibility: What information does a person or an organization have a right or a privilege to obtain, under what conditions and with what safeguards?

Information System ethics explores and evaluates:

o the development of moral values in the information field,

o the creation of new power structures in the information field, information myths,

o hidden contradictions and intentionality's in information theories and practices,

o the development of ethical conflicts in the information field. etc

Now let us take a look at privacy by the following examples. A few years ago, Florida lawmakers gave the go ahead to have monitors stationed in bathrooms at Tallahassee Community College to determine if the facilities were being underutilized. Students and faculty vehemently protested that the monitors violated their privacy. State officials said that the value of the information gained through the study was more important than the threat to privacy. Other issues like collection of private data of the users using internet by monitoring the traffic is strongly related to one's policy as that information can be further used for illegal purposes. These types of privacy issues are needed to be addressed properly so that they should not exploit one's freedom. One issue that I kept thinking about when I was constructing my Web page was whether it was ethical to lift an image from someone's home page and use it on my Web page without crediting the source. Such ethical issues come under property.

One reason that topics such as online gambling and pornography have become such firestorms of controversy in cyberspace is the simple fact that so many people have access to the Web sites. Simply put, if no one had access to online pornography no one would care. With this another issue "Censorship" comes which should be deal in efficient way as it is not easy to implement. Ethical issues can also be religious, moral or any other.These type of issues are not easy to deal with.

Similarly, let us take China into consideration on the issue of "Censorship". China has implemented the methods of censoring the internet that are somewhat harder to bypass for people generally unfamiliar with the way internet works. There is ,for example internet censorship as implemented in China--using a list of banned words that are censored on the fly. As users in china request a webpage , the incoming page is first inspected by government servers n blocked if a banned term such as "Democracy" is present. Human censors are also actively looking at what people browse on the internet, and block websites as they see fit.

Crimes on internet are also increasing in a continuous manner.Computer crime is a general term that embraces such crimes as phishing, credit card frauds, bank robbery, Industrial espionage, child porn, kidnapping children via chat rooms, scams, cyber terrorism, viruses, spam and so on. All such crimes are computer related and facilitated crimes. Many recent cases seen like Microsoft's website was brought down for a little time resulting in a huge loss to Microsoft. Similarly, NUST, one of the best considered university in Pakistan got Hacked and redirected to another domain. Credit card fraud have grown in an increasingly manner. Leakage of Military information from internet is another internet crime. Software known as Google earth, which shows information about different places including military land or can lead to robbery planning, is becoming an ethical issue around the world. Many people protest against this leakage of information but still one can't deny that it is one of the major enhancements in Information Technology.

The question about how to police these crimes has already been constructed, but this task is turning out to be an uphill battle. Since the first computer crime law, the Counterfeit Access Device and Computer Fraud and Abuse Act of 1984, the governments have been trying to track down and stop online criminals. The FBI of different countries have tried many programs and investigations in order to deter Internet crime, like creating an online crime registry for employers .The reality is that Internet criminals are rarely caught. One reason is that hackers will use one computer in one country to hack another computer in another country. And that criminal isn't working alone. Loosely organized groups--which security experts call "Web gangs"--conduct much of the illegal activity online. The structure of Web gangs may be patterned on that of traditional organized crime, in which the members of the group may never come into contact with one another and may never be aware of who they are working for.

Conclusion:

We live in an exciting time in history. The widespread availability of computers and Internet connections provides unprecedented opportunities to communicate and learn. Unfortunately, although most people use the Internet as a powerful and beneficial tool for communication and education, some individuals exploit the power of the Internet for criminal or terrorist purposes.

We can minimize the harm that such individuals do by learning ourselves, and teaching young people, how to use the Internet safely and responsibly. The term "cyberethics" refers to a code of safe and responsible behavior for the Internet community. Practicing good cyberethics involves understanding the risks of harmful and illegal behavior online and learning how to protect ourselves, and other Internet users, from such behavior. It also involves teaching young people, who may not realize the potential for harm to themselves and others, how to use the Internet safely and responsibly.

Cyberethics (Information System Ethics)
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Wednesday, February 6, 2013

Blocking Spam Mail Senders

Before you are able to block spam, of course, you have to know what spam is. Spam, actually, can be defined in various ways. But to avoid any complications, spam is any form of junk mail or email that just keeps on advertising. These are the kinds of mail, spam, that just give you headaches every time you open your inbox.

You did not ask for email about certain products that you do not even know of. You did not request for messages about your horoscope or other love advice. But instead of having some sensible messages in your inbox, you can't anymore due to the fact the spam has occupied most of your inbox space. A spam blocker is exactly what you need.

Spam Assassin, which is brought to the world by TCH, is an effective tool for blocking spam mail senders, especially from a certain server. If you opt to put Spam Assassin in its default mode, it will be disabled when a particular site is setup by TCH. Using this spam blocker assures you of a spam-free email address.

Blocking Spam Mail Senders

If you want to be more specific in blocking spam mail senders, you can block them by being more particular in the subject line area. Here is a simple step-by-step procedure for you to be able to do this more advanced intervention against spam.

First, you have to select Email Filtering, and then click Add Filter. Once you do that, a drop down box will show. In this first drop down box, you will click Subject.

If there is a first drop down box, there is bound to be a second one, right? Right. Well, in the second drop down box, you must click Contains.

And of course, a third drop down box is deemed to be inevitable. In this last drop down box, you are to type stop spam, or whatever collection of words or phrases it is or are that you want to filter or block. But you must always keep in mind that this field is very case sensitive. By that, what is meant is, when you type in the third drop down box the word obscene, the word ObScENe might not be blocked. This is, indeed, a disadvantage that will be worked on to make spam blocking a less nerve-racking predicament.

After that segment, you are to click Discard, Activate. Then after clicking those two previous separate buttons, click Go Back.

Blocking spam mail senders is not as hard as you might think it is. It is, actually, easier than perceived to be. All you need is more patience to be able to have an effective installation. Once you have blocked these annoying spam mail senders, you are bound to have a smooth time with your email addresses.

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Low Jeremy maintains http://spam-blocking.articlesforreprint.com This content is provided by Low Jeremy. It may be used only in its entirety with all links included.

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Thursday, January 31, 2013

Talk to a Stranger in Live Chat

What is Omegle?

Omegle is a brand new service on the internet for you to meet new and possibly old friends. When you use Omegle, the system will randomly select a person for you to speak with. This of course, will be a stranger. The chats are also anonymous so no one knows who is talking to whom.

How does it work?

Talk to a Stranger in Live Chat

You go to the Omegle website at Omegle and there you will be asked if you want to chat with a stranger by pressing the start to chat button. Almost immediately, you will find yourself connected to a stranger. Now you can chat away with different people and disconnect anytime you don't want to chat with a particular stranger anymore. The system will pair two people randomly for one-on-one private chatting. The site uses the two handles, 'stranger' and 'you' to connect people. It is a very simple system and very easy to use, no matter what your level of Internet experience may be.

History and Usage

When this service was launched, it generated about 100 users. Now at last report, (as of the month of April) the amount of people online at any time was reaching more or less around 3000. The report also states that the site is getting around 150,000 hits a day. The system mandates that you use certain chat names, which are "you" and "stranger." The site has an oddly chipper slogan that says, "Talk to strangers." The site also uses such phrases as 'your conversational partner has disconnected' at the end of every chat. These unique and unusual phrases seem to make the site more popular.

The concept of an anonymous chat is not the first chat that was created with Omegle. There have been comparisons made back to the early 1990s. It is said to have similarities to a web site called 'A Nice Chat,' which was created before Omegle. There is the difference that in 'A Nice Chat' the users were prompted to use a nickname that others would see. While in Omegle users are just known by "you" and "stranger" making it more clear that the conversation is anonymous.

At this time, there is no age limit or other limitations applied to anyone who wants to use the site. The site does not appear to block any profanity or spam bots with any filters. There are no charges, no fees, and no contact to use the site. There is also no registering and no need to create an account. The website is free to use.

Who uses Omegle?

All sorts of users use the site. Although it seems that, there are more teenagers but that is just a guess of the users that patronize the website. Some people have reported visitors from around the world and people of many different age ranges.

Omegle is a website that is used to communicate with anonymously and randomly picked people across the internet via a chat room. Leif K-Brooks of Vermont was the creator of this site. He launched the site in March of 2009. K-Brooks hope in creating this site was to provide an alternative way for people to connect in a non-threatening anonymous manner. He felt that too many people had become stagnant in the way they met people. K-Brooks thinks that people often seek out like-minded individuals who have the same goals and ideas. By mixing things up a little, people can meet other individuals who may have different ideas or different ways of looking at things. Variety can make a great difference in everyone's life. Check out Omegle and see what you think.

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Saturday, January 26, 2013

5 Basic Types of Internet Advertising

There are many forms of internet advertising available. Television basically only has one form, a short video clip either convincing people to use a product or at least forcing a customer to remember a product or service for the future. Conversely, there are many different ways to appeal to customers online and some of these ways are more effective than others. The basic kinds of internet advertising are pop-ups, e-mail advertisements, banner advertisements, endorsements from other websites, and social media.

Pop-ups used to be a very popular form of advertising. Generally, websites would send a tracking file to your computer called a cookie when you visited. These cookies could track your internet viewing and help companies tailor advertising to you. Often they could do other things like pop up advertisements on your computer. These pop-ups would force people to see the ads before being closed. Companies relied on this strategy to expose potential customers to their websites by force. However, most common spyware software will now prevent pop-ups and will block websites that use them. Do not scare customers away with this aggressive strategy. Avoid pop-up marketing.

E-mails can be another source of information for past customers. When a customer purchases a product at your website ask them if you can send regular updates with specials and new products. Remember that that is all they have agreed to. Selling your customers' e-mail address to other companies that spam or being an email spammer yourself will turn off your customers. Instead, have a visible privacy policy available on your website and use it. Spam e-mails are often blocked and easily deleted meaning that many of your hopeful e-mails will never be seen by your customers.

5 Basic Types of Internet Advertising

Banner advertisements can be another way to attract customers. Remember that these web placements cost money. Programs like Google AdSense may increase hits to your website but you pay by the click. The more popular your advertisement is, the more you pay. Also one of the more popular web browsers today, Mozilla Firefox, has add-on that blocks these advertisements. While they may be beneficial, think carefully before putting money into banner advertising. If you do decide to use banner advertising be sure to place ads on website that are relevant to your business

Affiliate marketing, which relies on other people to help market your products, may be another way to increase your traffic. This is equivalent to the commercial model for advertising. Basically another person or website endorses your products and business and convinces customers to visit you. Much like a celebrity selling a product through a commercial, you are relying on endorsements from other websites. Just remember that many companies associated with affiliate marketing charge commission meaning they get a percentage of sales. If your profit margin is relatively low you may either need to increase your prices, make less money, or maybe even take a loss for a while.

Last, consider social media for advertising. This can be something free like setting up a Facebook account where you communicate with existing customers. Or you can pay social networks like Facebook to advertise for you by placing ads on users' homepages. Since people often have to accept Facebook's scripts, it can be harder to block these advertisements.

Remember that not all forms of internet advertising are equal. It is easy to block and avoid spam, pop-ups, and some banner advertising. More effective ads like affiliate marketing can be expensive but they are still worth considering. Remember to track advertising's effect on your business and make educated decisions so that you know your money is being spent effectively.

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Wednesday, January 23, 2013

Digestive Health: Why You May be Suffering from 'the Leaky Gut Syndrome' and How You can Fix It

"Life and Death are in the Power of the Gut. They that master it shall prosper in health thereof. They that do not shall gnash their teeth in dis-ease." -Uzo Onuwkugha, MD.

You are not just what you eat; you are what you ingest, digest and assimilate. Everything you've ever eaten since you were a baby all contribute to your overall health and well-being up till this point. All the cells in your body have an immunological memory and imprint of all that you have eaten. The law of sowing and reaping works behind the scenes. Some people don't even understand that there are dietary laws that govern optimum health. We should stop focusing on the type of disease and start asking, "What type of person has the disease." Your cells tell the story better because it has a record (biological time clock) of your state of health even when it has not manifested with symptoms and no medical test could pick it up.

Well, you are as healthy as your individual cells. There is a law in Science that says that in a closed system, any phenomenon in a large scale is also repeated in a smaller time frame. Therefore, your cells hold the key to your overall health. To be precise, the focus is on the cells of your intestines. My zoom lens is on your small intestine where the majority of absorption and digestion of food materials take place. The word 'gut' is somewhat vague because it could refer to the digestive system, part of it or even the stomach.

Digestive Health: Why You May be Suffering from 'the Leaky Gut Syndrome' and How You can Fix It

Now, do you know the best selling drugs in America? It doesn't matter if it is over-the-counter or prescription drugs. The best selling drugs are antacids or drugs for intestinal disease remedies. You probably know all the brand names: Gelusil, Sucralfate, Mylanta, Pepto-Bismol, Tagamate, and all kinds of laxatives. Please note that taking antacids worsen the problem because these patients are suffering because of lack of acid. This is because their enzymes that manufacture acid (hydrochloric acid) are depleted. Neutralizing the little acid you have give symptomatic relief and tend to worsen the problem.

The target diseases include heartburn, gastritis, flatulence dyspepsia, ulcerative colitis, irritable bowel syndrome, colorectal cancer, chronic constipation and other forms of digestive ailments. Some of the diseases may not even have a well defined symptom or signs that fit into a definite clinical pattern. That's why they are often called syndromes.

Many times, clinical tests will reveal nothing, and yet the patient continues to agonize. What is the underlying cause of these diseases? The answer is not what you think. It is an uncharacterized phenomenon most doctors don't talk about. The name is 'the leaky gut syndrome.' It is simply saying that your intestines are ailing because they are short of energy as such has become porous. I prefer a more scientific term called 'intestinal permeability disease.'

The onset coincides with depletion of functional enzymes in the body. This is the time when the resilience of youth tends to wean. Depending on your dietary habits, it peaks around late twenties or early thirties. Rapid aging seem to pick up at this point. It is a process that sneaks in on you. At this time, your hairs begin to thin and fall off. Bald head set in. Some of your hairs may even start graying because of nutrient depletion especially the B-complex Vitamins. Symptoms of intestinal malady seem to worsen at the same time. People begin to notice bloating, gas, belching, constipation and lactose intolerance.

The key to explaining 'leaky gut syndrome' lies at the cellular level. The small intestine has the hardest working cells in the human body. These complex cells may even work harder than brain cells. (No wonder they are called 'brain in the gut' because they have all the chemical messengers found in the brain.) In fact, the gut is regarded as the center of life and intuitive thinking. People tend to called it gut instinct--a meeting point of supernatural and physical energy. The Japanese call it the 'power center.' The cells of the gut are arranged in finger-like fashion called villi--designed to increase the surface area for absorption of nutrients. This process is an energy-dependent mechanism called active transport. (Water is absorbed by osmosis and is not energy-dependent).

Thus 85% of our life-time energy is used in digestion, absorption and assimilation of food. You could imagine that only 15% is reserved for the rest of the body for active work and other functions. Do you see why your digestive health is very important? Everything about life is energy and sickness is nothing but lack of force. It is either you take care of your digestive health or live at the mercy of the medical community. Most times they are confused because most doctors are not trained in nutrition therapy.

Furthermore, the gut acts as a semi-permeable membrane. In other words, it has a gating mechanism that allows some nutrients to pass while eliminating others. For instance essential nutrients like minerals, vitamins, and essential fats are absorbed while toxins, bacteria, parasites, and partially digested or allergic foods are prevented from entering the blood. These wastes are eliminated through the stool. However, if the linings become porous like an old filter, everything goes into the blood without restrictions. The gut is now said to be leaky. Note that most of the junk food all full of nutrient-depleted, energy deficient elements called oxidants or free radicals. Because these substances lack electrons, they are very reactive and attack the cell membrane lipid bi-layer. The tight and gap-junctions between cells also give way creating more holes on the membranes.

As the unwanted substances and chemical toxins pass through, they now set up a chain reaction. The body hates these intruders just like you hate spam. The body tries hard to fight off these free radicals as foreign bodies. Often there is no help from the victim who continues to eat junk, nutrient-depleted food causing more free radical damage. The stage for auto-immune reaction has already been set by these allergens and carcinogens (allergens are foods that cause allergy and carcinogens are risk factors for causing cancers). At this time, the body's defense mechanisms are also down giving rise to all kinds of degenerative diseases or even cancer depending on the end organ and nutritional deficiency involved. Leaky gut also triggers premature aging process. The victim also suffers from chronic fatigue. (Food is should give energy and not deplete your reserve).

Foods that cause leaky gut include fast sugars, partially hydrogenated and trans-fats, wheat gluten, yeast, bacteria, viruses, canned nuts, dairy products, cigarette smoking, alcohol, corn-syrup solids, food additives and flavors. Acidic foods and free radicals worsen the whole scenario. All non-living foods, chemicals, processed foods and all junks food deplete the body of the existing enzymes and leave it open for attacks with all kinds of illnesses. For instance one teaspoon of sugar shuts down your immune system for two hours. Also if you eat in a hurry without chewing your food or meat very well, you are a candidate for leaky gut syndrome. Digestion is a process and it starts in the mouth coupled with your state of mind. Stress is a powerful contributory factor.

Here is the good news: "Anything that can prevent a disease can also help to cure it," said Dr. Bernard Jensen. These foods boost your immunity, attack free radicals, strengthen your intestinal walls, help digestion and absorption, cleanse and detoxify you, give you energy, and add more years to your life and more life to your years. The list of healthy alternative is many. But my favorite is a bunch of green super foods--barley grass, wheat grass, chlorella, green kamut, wheat grass, alfalfa and spirulina. Please add avocado to your staple diet. Also essential fatty acid blend (omeg-3, 6 and 9), multivitamin and mineral supplements, aloe vera-papaya, periodic fasting and colon cleanse. Avoid junk and processed food. Drink eight glasses of water per day. Our body is 70% water. Water supports metabolism and help to eliminate toxins that cause diseases and ravages of premature aging. Don't forget the recommendation of at least five servings of green leafy vegetables daily. Minimize acidic food eat more of alkaline food. Practice food combining to make it easy on your digestive enzymes. Don't eat for at least 3 hours before you go to bed. (The body heals itself at night). Otherwise the body will use the energy for regeneration and repair to digest food. This makes you tired when you wake-up.

I must add that I take lemon juice and green tea regularly. Just cut off taking coffee it can worsen the leaky gut. Lemon is excellent because all the bacteria that cause disease hate anything bitter. They love sugar because they can multiply in nanoseconds. Both lemon juice and green tea help digestion (has life enzymes) and boost your immunity and strengthen your enzyme reserves while cleansing your system. Both are potent antioxidants that combat free radicals that cause lack of energy and aging. Lifestyle of regular exercise should be added.

Exercise is so important that it requires a special emphasis. Lack of exercise causes intestinal paralysis of some sort. This gives undigested food more transit time to sit in the gut and for toxins to leak into the blood triggering degenerative changes, allergy and stagnant immune system. However, when you exercise, nature cooks the food twice-- both in the stomach (more acid is mixed with the food) and in the intestines. This improves digestion and elimination of wastes. Overall, many people notice bowel movement during or shortly after exercise. Also exercise draws air into the body which is more efficient in combating the bugs that cause diseases. Disease does not exist in aerobic environment. All cells start to age when they don't get enough oxygen. Many other benefits of exercise are beyond the scope of this article.

In a nutshell, if you do these basic things, including adding raw food to your diet you will improve the quality of your life and enjoy optimum health all the days of your life. The key is to take responsibility for your own health. Watch what goes into your mouth. Educate yourself on how your body works. Listen to your body. Give it what it needs to serve you better. Your life is in your hands; not the doctor. Don't kid yourself. You don't put water in your gasoline tank. Do you? Don't think you're a machine. Even machines break down. Before you blame God and your parents, change your eating habit first. There are healthy alternatives to the junk you see all around you. Good health is lifelong journey. The earlier you start the better. Good luck in your quest for optimum health!

Digestive Health: Why You May be Suffering from 'the Leaky Gut Syndrome' and How You can Fix It
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Uzo Onukwugha has developed a site with a heartbeat towards training info-marketers the inner game of business success. You cannot divorce a life of inspiration from business success. Laws of life are the same laws that power success in any endeavor. To learn more, visit his site at: [http://www.weblinkbusiness.com] and subscribe to his newsletter and e-course. Reach him with your comments and concerns at: uzonukwugha@yahoo.com

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Monday, January 21, 2013

Configure Exchange E-Mail Server Reverse DNS and MX Records Correctly

If DNS is setup incorrectly, over time your mail server IP will be added to blacklists. Nowadays most E-Mail servers have some kind of spam protection service which in turn means that all your inbound mail will be blocked if you do happen to be listed on a spam blacklist.

In this article I will describe how to correctly configure your MX and reverse DNS records for your mail server. This article is based on an Exchange 2003/2007 server but every other messaging server will follow the same principle.

Assigning an IP address

Configure Exchange E-Mail Server Reverse DNS and MX Records Correctly

Starting from the bottom up the first thing you need to do is assign a static external IP address to the internal private address of your mail server. You will need to apply these rules on your firewall to port forward SMTP (port 25) and NAT an external IP address to the internal address of the server.

Something that a lot of administrators forget to do or check is to set the outgoing NAT rule to use the same external IP address created for the inbound rule to the mail server. If this isn't set, Reverse DNS will not match and in turn your mail server will be listed on blacklists. If your firewall rules are setup correctly the IP address listed on this page should be the same IP address you mapped to the internal private IP address of the mail server.

Create the MX records for your mail server

For the purpose of this example, listed below are all the details of my mail server to help you understand what you need to do.

External IP: 87.22.1.22

E-Mail Domain: domain.com

You will need to be an administrative contact for your External DNS provider for your domain to make these changes. In most cases this can be done through an online control panel through your DNS provider. Failing that on the phone or via E-Mail.

1. The first thing we need to do is create an A record to point to the external IP address mapped on your firewall to the mail server. The host A record can be called any thing but is commonly called "mail". In our example we will create "mail.domain.com" to point to IP address "87.22.1.22"

2. Next we will create an MX record to point to the newly created A record of our mail server.

Within your DNS control panel select "add MX record". Make sure that the host address is the root domain name in our case "domain.com"

Set the FQDN as the A record we just created which in our case is "mail.domain.com".

The lowest property is the most preferred but in our example we will set the priority as 10.

Use NSlookup to check DNS and MX records are applied

It can take up to 48 hours for DNS to propagate but in most cases 12-24 hours. To check our DNS entries are applied and correct we can use nslookup.

1. Open a CMD prompt and type nslookup

2. Type set type=mx

3. Type the domain name which in our case is domain.com.

In our example the output should read as follows if correctly setup:

> domain.com

Non-authoritative answer:

domain.com MX preference = 10, mail exchanger = mail.domain.com

mail.domain.com internet address = 87.22.1.22

Configure Reverse DNS

Reverse DNS is used to verify that the mail server is who it says it is. The recipients mail server will do a reverse lookup to make sure that the IP address of the mail A or host record in DNS is the same as the IP address it is communicating with. Only 1 RDNS entry can be present per IP address.

To do this you will need to contact your ISP to make this entry. You will not be able to do this in your DNS control panel unless your ISP also host your DNS and give you the functionality to add your own RDNS records.

In our case we would contact our ISP and advise that we would like to create an RDNS entry for our IP address 87.22.1.22 which would resolve too mail.domain.com.

Verify Reverse DNS

Again it can take up to 48 hours for DNS to propagate but in most cases 12-24 hours. To verify that the RDNS entries have been added and are correct do the following:

1. Open a CMD prompt.

2. Type Ping -a 87.22.1.22 (This is the external IP address for your mail server. In our case we use our external IP address stated above)

If RDNS is configured correctly the following output will be shown:

C:UsersUser>ping -a 87.22.1.22

Pinging mail.domain.com [87.22.1.22] with 32 bytes of data:

SMTP Banner

Every time a mail server establishes a connection with your mail server it shows its SMTP banner. This banner must be resolvable on the internet and best practice is to have it as your mail host/A record.

Configure SMTP banner Exchange 2003

1. Open Exchange system manager.

2. Expand your administrative group ("First administrative group" by default).

3. Expand Servers.

4. Expand YourServerName.

5. Expand Protocals container.

6. Select SMTP container.

7. On the right window, right click the Default SMTP virtual Server (Or the name you set your SMTP Server) and

select Properties.

8. Select the Delivery Tab.

9. Click the Advanced button.

10. Under the Fully-qualified domain name type mail.domain.com (The A/Host record you created in DNS for your mail server)

11. Click OK and OK again to accept the changes

Configure SMTP banner Exchange 2007/2010

1. Open the Exchange management console.

2. Select the Organisation Configuration container.

3. Select Hub Transport container.

4. On the right select the Send Connectors tab.

5. Right click your send connector and select properties.

6. On the General tab under the Set the FQDN this connector will... type the A record domain name you created. Which in our case is mail.domain.com. Click OK.

7. Under the Server Configuration container click the Hub Transport container.

8. In the Right window Select the properties of the Receive Connector under Receive Connectors tab.

9. On the General tab under the Set the FQDN this connector will... type the A record domain name you created. Which in our case is mail.domain.com. Click OK

To verify these changes we can use telnet to view the output upon establishing a connection on port 25 to our mail server. Use the following steps to do this:

1. Open a CMD prompt

2. Type Telnet mail.domain.com 25.

The output you see should look something like this and contain your A record of your mail server:

220 mail.domain.com Microsoft ESMTP MAIL Service ready at Sun, 28 Feb 2

010 17:51:20 +0000

If you use an edge server or a SPAM filter appliance like a Barracuda the SMTP banner will have to be set on this device/server.

Check to see if your mail server is on spam lists and/or an open relay

A great website to use to check your MX records, RDNS, check if your mail server is an open relay and check to see if you are listed on spam lists is www.mxtoolbox.com. This is a great site and one to keep in your favourites.

Following these guide lines will successfully and correctly configure mail routing to and from your mail server. The next step is too secure and ensure your mail server is not an open relay. I will be writing a separate article dedicated to this in the near future.

Configure Exchange E-Mail Server Reverse DNS and MX Records Correctly
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If you would prefer to not experience the stress in looking after and maintaining an Exchange server environment you may choose a hosted exchange server solution instead.

Mike Collins has over 10 years experience in computing and is a senior IT Consultant at Sphere IT Consulting

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