Why does AMES delay my incoming Email and what is Graylisting?

What is Graylisting?

Graylisting is a method to verify the proper retry delivery of a mail server. We use Graylisting on "catch-all" accounts as a method to stop dictionary attacks. With a dictionary attack, an attacker tries to find valid recipients in a domain by sending hundreds or thousands of messages to different (non-existing) recipients within a domain. When a "catch-all" account is configured in AMES, we are forced to accept all of these messages and filter them.

Most of these non-existing user messages will be saved in your quarantine. Therefore, it is hard to find and delete those messages within the quarantine and produces herewith a large load on our platform.

Graylisting is a principle that uses the queuing system of mail servers. Any Email that is send to our platform by an unknown mail server will be temporary rejected. If the Email is legitimate, the mail server has to queue the message and retry to send the Email within 5 to 10 minutes. The resent message will be then accepted by AMES, filtered and delivered to you. This information will be saved for a certain period of time, so that future delivery attempts from this server will be accept at the first time, without any delay.


Is Graylisting enabled for my AMES domain?

We only use Graylisting on "catch-all" accounts.


How can I switch off the Graylisting?

You can avoid the Graylisting by creating users in AMES using an alias, e.g. *.domain.com instead of a "catch-all" account. Thereby, the Graylisting will be automatically circumvented.

Affected products

  • Avira Managed Email Security [Windows]
  • Created : Monday, January 27, 2014
  • Last updated: Friday, February 21, 2014
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