Enable Plesk Internal Spam Protection

To enable the spam filter for a mailbox:

  1. Go to e-mail > desired e-mail address > Tab Spam filter.
  2. Activate the check box at Activate spam filter for this e-mail address.
  3. Indicate what should happen to messages that are classified as spam.
    • If you want to filter emails using the software on your local computer, select the option Flag spam messages by following text in the subject line and then specify how the spam filter should mark messages recognized as spam. The headers & #8222; X-Spam Flag: YES & #8220; and & #8222; X-Spam Status: YES & #8220; are added by default to the source text of the message. If desired, the spam filter can also add a specific text string at the beginning of the subject line.
    • If you are sure that the spam filter is accurate, you can choose to automatically delete all incoming messages identified as spam. To do this, select the option Delete all spam messages.
    • (Linux only) If you want to access your mailbox through the IMAP protocol and want the spam filter to send all sorts of spam messages to the IMAP folder named & #8222; Spam & #8220; shifts, you have the option Move spam to the spam folder activate.

      Since all messages are automatically removed from the spam folder after 30 days, you must regularly check the contents of the spam folder to make sure you do not miss any important messages. Move non-spam messages to the Inbox.

      If the option Move spam to the spam folder You can train the spam filter and improve accuracy by moving messages from the Inbox to the Spam folder and moving non-spam messages from the Spam folder to the Inbox.

  4. If the spam filter does not filter many spam messages or make many false spam assignments, you need to adjust the filter sensitivity. To do this, click on Show advanced settings and enter the desired value in the field Spam filters sensitivity one.

    In most cases, the default value 7 is sufficient. But if too much spam gets through the filter, you should reduce the sensitivity value by one and see if the number of incorrectly filtered spam emails is reduced. If not, you can further reduce the sensitivity. On the other hand, if legitimate emails are marked as spam, you must increase the sensitivity value. However, in both cases it is recommended to change the sensitivity by no more than one and always wait a few days before adjusting the sensitivity further. Changing the sensitivity by several points at once can result in drastic changes in the behavior of the spam filter.

    Note: To further improve the accuracy of the spam filter, you can train it based on the received e-mail messages (as described below).

  5. If you want to make sure that you do not miss e-mail messages from specific senders, add those e-mail addresses or domain names whitelist added.

    Either write each address in its own line or separate the addresses with a comma, semicolon or space. You can use an asterisk (*) to replace multiple indefinite letters and a question mark (?) For a single indefinite letter. For example: adresse@mycompany.com, user?@mycompany.com, *@mycompany.com. The indication *@mycompany.com will include all email addresses listed under the email domain & #8222; mycompany.com & #8220; are registered, add to the whitelist.

  6. If you do not want to receive e-mail messages from specific domains or individual senders, add these e-mail addresses or domain names blacklist added.

    Either write each address in its own line or separate the addresses with a comma, semicolon or space. You can use an asterisk (*) to replace multiple indefinite letters and a question mark (?) For a single indefinite letter. For example: adresse@spammers.net, user?@spammers.net, *@spammers.net. So with *@spammers.net the whole email domain & #8222; spammers.net & #8220; blocked.

  7. If you use a Windows-based customer account, you can also add trusted languages and fonts. This allows e-mails written in the specified languages and fonts to pass through the spam filter and will not be marked as spam.
  8. On Windows-based customer accounts, you can also specify IP addresses of computers or networks from which emails should always be accepted. When specifying network addresses, enter an address and add a netmask after the slash. For example 192.168.10.10/24.
  9. click on OK.

You can improve the accuracy of spam detection if the SpamAssassin spam filter on the server is enabled for your account and you access your mailbox through the IMAP protocol.

To improve the accuracy of spam detection:

  1. Open your mailbox with Webmail or an email client program installed on your computer.
  2. Check the messages in your folder inbox, Move all spam messages to the folder spam, In this way, the SpamAssassin spam filter learns to detect spam more efficiently.
en_USEnglish
de_DEDeutsch en_USEnglish
Scroll to Top