FASTPANEL® allows you to enable anti-spam module SpamAssassin.
Additional apps installation manual can be found in "Additional apps installation" article
After SpamAssassin app it is required to enable it in subsection "Other" of the "Basic settings" section
After this feature is enabled SpamAssassin module will start filtering incoming email messages. Messages that are recognized as spam will not be delivered to the mailbox.
Also, after turning on this setting, the option "Reject spam" appears in the mailbox creation or editing cards; when this option is enabled, all emails that are recognized as spam will be saved in the "Spam" folder in the mailbox.