As our mail server is a big organization, we have a lot of SPAMS each days.
Currently our
SPAM configuration is :
- Sensibility : HIGH
- Level: 6/6
In addition
E-mail WBL is installed with RHSBL Active.
DNSBL -> is disabled because it will refuse a lot of emails that we should get !
So I advice you moreover of this configuration to always check the 'IP' Spammer and checking the origin of the IP with this web tool :
https://www.countryipblocks.net/I Suggest you to block country IP that you may not receive any email.
From example, our 70% of our Spam come from Vietnam, so I took all the CIDR IP and block it with IPTABLES.
Our SPams decreases a lot with IPTABLES...
just an advice