Mass unsolicited emails are referred to as spam or junk email. The Zimbra Collaboration Server installs the SpamAssassin anti-spam software as the mail filter to identify spam mail. At installation, the spam training filter is enabled and two feedback system mailboxes are created to receive mail notification.
When a message is tagged as spam, the message is delivered to the recipient’s junk folder. Users can view the number of unread messages that are in their junk folder and can open the junk folder to review the messages marked as spam.
You can set rules for handling spam from the Global Settings>AS/AV page. How these rules are configured determine how aggressively spam is filtered.
Procedure
To modify the default settings, go to the Configure>Global Settings>AS/AV page.
In the Spam checking Settings section change these settings.
Kill percent. The default is mail that is scored at 75% is considered spam and is not delivered.
Tag percent. The default is mail that is scored at 33% is considered spam and is delivered to the Junk folder.
In the Subject prefix text box, enter the text that should be added to the subject line for messages tagged as spam.
Click Save.
See the Administration Guide for information about the spam training mailboxes.
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