The following Plesk Anti-spam tools are used, however, incoming spam messages are still delivered:
- SpamAssassin Spam Filter
- DKIM, SPF, and DMARC Protection
- DNS Blackhole Lists
- Plesk Premium Antivirus
- Server-wide Blacklist
The spam filter is not optimized.
The following measures can be applied for spam filter optimization:
Decrease spam filter sensitivity:
For the particular mailbox
Note: it is possible to edit spam filter sensitivity for the particular mailbox if only the Apply individual settings to spam filtering checkbox is enabled at the Plesk > Tools & Settings > Spam Filter page.
Go to Plesk > Tools & Settings > Spam Filter page.
Decrease the Spam filter sensitivity and press the OK button to apply changes.
Train SpamAssassin according to the article:
Consider to use additional anti-spam tools.
Lock spammer mailboxes by applying solution from the following article: How to block a particular mailbox or a range of mailboxes belonged to a specific domain from sending emails to Plesk server?