Mail Antispam

The Mail Antispam app works in conjunction with your mail server. The software identifies spam using a wide range of algorithms on e-mail headers, networks, IP addresses and mail contents.


If your system does not have this app available, you can install it via the Marketplace.

You can find this feature in the menu system at the following location:

<navigation>Server|Mail|Mail Antispam</navigation>

ClearCenter Antispam Updates

The open source SpamAssassin solution is the antispam engine used in ClearOS. This software automatically checks for base-only updates on a weekly basis. This is already included in ClearOS for free!

In addition, the ClearCenter Antispam Updates service provides additional daily signature updates to improve the effectiveness of the antispam system. These signatures are compiled from third party organizations as well as internal engineering resources from ClearCenter. We keep tabs on the latest available updates and fine tune the system so you can focus on more important things.


Discard Policy (Block Policy)

If you want to discard spam before it reaches mailboxes, you can configure the mail discard policy. For example, you can discard spam marked with high probability (or higher) by using this tool.

Subject Tag

  • Use Subject Tag - enable/disable e-mail subject tag when e-mail is marked as spam
  • Subject Tag Threshold - spam score required to trigger a change in the e-mail subject
  • Subject Tag - the subject tag to use when e-mail is marked as spam

A subject tag can be added to messages marked as spam. For instance a spam message with the subject “Premier Invest0r Rep0rt” will be transformed into “[SPAM] Premier Invest0r Rep0rt”. This feature makes it easy for end users to identify and filter spam.

White and Black Lists

  • White List - a list of e-mail addresses that should never be marked as spam
  • Black List - a list of e-mail addresses that should always be marked as spam

The antispam engine includes both white and black lists. The white list is used to mark e-mail addresses that send non-spam, while the black list is used to mark e-mail addresses that are known spam. Entries should be listed one per line.

Among others, newsletters and legitimate e-commerce e-mail can sometimes be marked as spam. The e-mail addresses for these messages can be added to the white list to prevent the message from becoming marked as spam.


content/en_us/6_mail_antispam.txt · Last modified: 2015/08/07 06:01 (external edit)