Under 'Mail', select the email account for which you want to configure anti-spam settings. Click on the 'Spam Filter' tab. Here, you can enable the spam filter and configure its sensitivity, white list, and black list. Adjust these settings as needed and click 'OK' to apply them.
To switch on spam filtering for a mailbox:
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Go to Mail > email address > Spam Filter tab.
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Select the checkbox Switch on spam filtering for this email address.
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Specify what to do with messages classified as spam.
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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.
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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.
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(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.
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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 cases it is recommended not to change the sensitivity by more than one at a time and to wait for a few days before adjusting the sensitivity further, as changing the sensitivity by a few points at once may result in drastic changes in the spam filter’s behavior.
