Hello, I ran into a bit of an issue trying out fqrdns.pcre as recommended here in this thread. The header in the file recommended adding it into smtpd_client_restrictions. However if I place it there, I end up rejecting mail even from SASL authenticated client devices, if they also match a rule in fqrdns.pcre.
Is it acceptable to put it into smtpd_relay_restrictions instead? I am worried if I do this, it would not be able to prevent these bad hosts from sending mail directly to my domain (non-relay), which kind of defeats the purpose of using it for botnet protection. I have some dynamic clients, and I don't know what subnet they'll be on since they're mobile devices with an IP from the mobile provider, so whitelisting isn't going to work very well if they roam somewhere surprising, like a different unexpected provider. Thanks, Matthew.
