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Spam Filter - Overview

The Domaintechnik.com Spam Filter consists of five filter stages and allows for absolutely reliable filtering of unwanted messages without the otherwise usual risk of losing required messages by mistake.

Actions taken in the filter stages one to four apply to all email accounts of your package. These stages are active by default. You may disable these filtering-mechanism at general settings.

Step five filtering-mechanisms are inactive by default. You may enable and configure them individually for each account at the account-settings-dialogue.


Spam Filter - Summary of Features

The Five Filter Stages in Detail:

  • First Filter Stage
    In the first filter stage our filter system checks if the sender of the email has a valid reverse DNS entry. At the same time, the MX entry of the sending domain is checked if an "IN A" entry exists. This "IN A" entry must be available, otherwise error messages would not be able to be delivered to the specific server.

  • Second Filter Stage
    During this stage, messages that have been sent from an already known spamserver, are filtered. The lists of known spamservers are updated hourly by Domaintechnik.com.

  • Third Filter Stage
    This step includes a check if the sending server responds with a correct HELO/HELO, and whether or not the sending email contact is correct.

  • Fourth Filter Stage
    At this stage, a procedure called "Greylisting", which is a mixture between Whitelisting and Blacklisting, is applied. According to the email protocol, the sending mail server is requested to send the message again, whereby most spam-mass email programs fail to do so, and abort sending. Since this is a very strict expulsion process we have modified rules contrary to other providers. Therefore we are able to guarantee maximum compatibility to badly configured posting email servers, so that in no case, any messages desired by you, are lost.

  • Fifth Filter Stage
    The fifth filter stage is the part of our Spam Filter System which can be configured in the Domaintechnik Control Panel, free of any charges. There are several filter categories and, if required, you can add contacts to your own Whitelist and/or Blacklist.


Advantages of the 5 Stage Filter System
By simultaneously applying five fundamentally different systems with a very small threshold for filtering, we reach a very high success rate.

Additionally however, we can be sure that our customers do not lose any messages, since every single filter only filters messages obvious for that specific filter, and thus, the error ratio is heading towards zero.