# Restricts which clients this system accepts SMTP connections from.

mondomain.com             REJECT Fraud rejected
example.com               REJECT No spammers
.example.com              REJECT No spammers, from your subdomain
123.456.789.123           REJECT Your IP is spammer
123.456.789.0/24          REJECT Your IP range is spammer
321.987.654.321           OK
example1.com              OK