Does Zimbra have anti-spam and anti-virus features?

Anti-Spam Protection

SpamAssassin and DSPAM are spam filters bundled with ZCS. When ZCS is installed, spam training is automatically enabled to let users train spam filters when they move messages in and out of their junk folders.

A Subject Prefix can be configured so messages considered as spam are identified in the subject line as tagged as spam. When a message is tagged as spam, the message is delivered to the recipient’s Junk folder.

You can change these settings from the administration console, Global Settings Anti-Spam tab.

Anti-Virus Protection

Clam AntiVirus software is bundled with the Zimbra Collaboration Suite as the virus protection engine. The Clam anti-virus software is configured to block encrypted archives, to send notification to administrators when a virus has been found, and to send notification to recipients alerting that a mail message with a virus was not delivered.

The anti-virus protection is enabled during installation. You can also enable or disable virus checking from Global Settings on the administration console. By default, the Zimbra MTA checks every two hours for any new anti-virus updates from ClamAV.

Note: Updates are obtained via HTTP from the ClamAV website.