Archive for 'Postfix'

Gathering statistics from your postfix mail logs

I have been supporting postfix mail relays for several years. When you are tasked with ensuring that your SMTP relays work without issue, you need to stay on top of the logs and the current operational state of each server to prevent major problems from occurring. Problems can take the form of blacklisted relays, mail […]

Testing postfix restrictions

The postfix mail delivery system allows one or more restrictions to be placed on incoming messages. These restrictions allow you to block messages when clients don’t use the SMTP handshake as outlined in RFC 821 during delivery, if the name supplied in the HELO is not fully qualified or fails to resolve, or if the […]