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Knowledge Base

Protecting from Spam

 
customer guidemail settingsemailemail securityimap

Watch the video tutorial

Note: To protect your mail from spam and viruses, you can also try the
Plesk Email Security extension.

To switch on spam filtering for a mailbox:

  1. Go to Mail > email address > Spam Filter tab.

  2. Select the checkbox Switch on spam filtering for this email
    address
    .

  3. Specify what to do with messages classified as spam.

    • If you want to filter mail with the software on your local
      computer, select the option Mark spam messages by adding the
      following text to message subject
      , and then specify how spam
      filter should mark the messages recognized as spam. “X-Spam-Flag:
      YES” and “X-Spam-Status: Yes” headers are added to the message
      source by default, and if you want, the spam filter will also add
      a specific text string to the beginning of the subject line and to
      the message body.

    • If you are sure that your spam filter is accurate, you may want to
      set the filter to automatically delete all incoming messages
      recognized as spam. To do this, select the option Delete all
      spam messages
      .

    • (Only for Linux) If you are accessing your mailbox over IMAP
      protocol and want the spam filter to move all messages considered
      spam to the IMAP folder called Spam, select the option Move spam
      to the Spam folder
      .

      Because all messages are automatically removed from the Spam
      folder after 30 days, you will need to review the contents of the
      Spam folder on a regular basis to make sure you do not miss any
      important messages, and move all non-spam messages back to the
      Inbox folder.

      When the option Move spam to the Spam folder is selected, you
      can train the spam filter and improve its accuracy by moving spam
      messages from Inbox to Spam, and non-spam messages from Spam to
      Inbox.

  4. If the spam filter misses many spam messages or gives many false
    positives, you need to adjust the filter sensitivity. To do so, click
    Show Advanced Settings and type in the desired value in the
    Spam filter sensitivity field.

    The default value of seven works well in most situations, but if too
    much spam gets through, decrease the sensitivity value by one and see
    if the number of uncaught spam emails decreases. If it does not,
    decrease the sensitivity further. If, on the other hand, legitimate
    mail gets tagged as spam, you need to increase the sensitivity. In
    both…

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