Plesk has a default anti-spam filtering system which is regularly updated and allows us to combat spam at the server level.
Among its protection measures, we can find:
SpamAssassin Antispam: which establishes a score on incoming emails, with which it can identify through an algorithm whether the email is spam or not.
Greylisting Antispam: in an updated list containing domains and IPs that perform spam, the only drawback being that it can slow down the entry of email.
