Tips for Avoiding Anti-Spam Filters While Sending Emails and Newsletters 

You don’t control this part anymore. • In case the server fails you will never know because what will happen is your DNS request will fail. • You can never determine how good your servers really are although there are some ways and test performed to find out on those providers specially those

by Steve Brody Friday, May 13, 2011
com. They don't really have the capacity that is enough to check every single message the comes in specially since 90% of those messages are spam. At first, all the IP checks are dump, so when someone connects to you, you will notice the IP of that particular someone, same as before. However, protocol such as SMTP says that SMTP exchange start and the you are asked by the SMTP protocol to say "HELO" word,a helo with just a single "L". This word is really spelled this way and is not a mistake. You can also have the enhanced helo---- "EHLO" and you are obliged to pass your domain name, your name.

There will be a lot of SMTP servers who will check why did you pass your "HELO" name and then they will compare it to the IP that you have passed. Since you already have the IP address and the domain name, you can then resolve this one to see and compare if you got the IP address that is similar to the ones the you are connected to. You can also have it backwards.

From the IP address that you have, you can resolve it into domain name and this is called the reverse DNS resolve or also known as the PTR request where you get the domain name from the IP address that you have. There are also those servers that can perform both, they con convert the name into IP address or vice versa. Yo can convert the domain name to IP and convert IP to domain name and compare the results.

We will now come to the checking of the message. A lot of spam checks, just checks the message only while there are also those that checks not only the message but the header as well. The entire envelope including the headers sch as the subject, date, your received from and those headers that are appended by other servers and so on.

Inside the message itself, when you actually get to the message, there are a lot of stop words that spammers used, like a lottery scam would used staff like “you won the lottery” or something like “become a millionaire” or “get rich quick” or something like that. The stop-words are haunted like crazy. List of headers that can indicate fake mail client, for example, each mail client has a certain way of position in their headers inside the message. Let’s say, you have an outlook, it would always encode the message in such a way that there is first text portion stripped out of html or any formatting like fonts and so on and after this there is a mime encoded html rich text message and it is always like this. Definitely, spam checks know it.

If they see a header that says “Yes, I am outlook express” but the position and order of the headers do not correspond, they will just say “Ok. They say that they are outlook express but they don’t look like outlook express so we will either reject it completely or we will treat is as suspicious. ”

EXE files, ZIP files and attachments or those that are alike are blocked by some filters. They will prompt a message that says" We do not accept any attachments.

General | Categories: mining
0    submitted by Steve Brody
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