==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.3 (latest)
- Linux/BSD distribution name and version: Ubuntu 18.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello all!

Among all my customers we are getting many "Insurance" spam mails.
These mails are all well made and do not match the classic spam patterns and do not match DNSBL.

This causes a standard iRedMail installation with Spamasassin, Amavis, Graylisting etc. to actually pass these mails to our customers.

We are talking about dozens of emails per day per mailbox which are making their way though the spam filter.

What can be done to fight these spam emails?

Thank you!

Best regards,
Bernhard