This service designed to report postfix to reject or not requested address by tcp_table protocol. Service looks through postlog-sa statistics table.
- Postfix
- Postlog-sa
Use score section to set reject trigger. Interval value sets period in days since now to past and the limit is the probable factor of the spam activity.
[score]
interval = 70
limit = 0.2
Add lookup table rule to the postfix main.cf
# Permit all connections except local black listed clients
smtpd_client_restrictions = check_client_access tcp:my.server.address:2000
# It's generally polite to say who the mail is from. Again,
# very few real mail do not have a return address, most who don't are spam.
smtpd_sender_restrictions = reject_unknown_address,
check_sender_access tcp:my.server.address:2000
Postfix client/server table lookup protocol (http://www.postfix.org/tcp_table.5.html)