How to enable spam filter in Plesk control panel ?

The SpamAssassin spam filter identifies spam messages among emails sent to mailboxes hosted on your Plesk server.To achieve the desired level of spam protection, Plesk lets you configure a number of SpamAssassin settings, namely:

[1] Log into the Plesk Control Panel for your domain

[2] Click on subscriptions >> subscription name

[3] Click on Mail

[4] Click on Mail Id

[5] Click on Spam Filter

[6] Enable – Switch on spam filtering for this email address

[7] Spam filter sensitivity :

To identify spam messages, SpamAssassin performs a number of different tests on contents and subject line of each message. As a result, each message scores a number of points. The higher the number, the more likely a message is spam.

[8] Spam marks :

Server Level not has server wide spam filter which automatically delete the spam and you can only do it on per-mailbox basis. If you want to get a server wide policy then you should choose only the way of treating messages as spam i.e. X-Spam-Flag: YES and X-Spam-Status: Yes.

[9] Maximum size of messages to check :

Analyzing a huge number of emails can heavily increase the load on your server. To avoid this, you can set the maximum size of the message that the spam filter will test.

[10] Number of SpamAssassin processes :

Another way to limit the server loading by SpamAssassin is defining the maximum number of SpamAssassin processes (on Linux) or threads (on Windows) running simultaneously on the server.

[11] Trusted languages and locales (only on Windows) :

You can define the language characteristics of mail that should always pass the filter by specifying trusted languages and locales. Letters written in the specified languages and with the defined character sets will not be marked as spam.

[12] Click on ok