One server I poke around on, has a number of postfix instances
(see: postmulti).
Interestingly, one instance was logging things like :
Oct 26 22:02:05 mail postfix-blah/smtpd[59158]: connect from unknown[1.2.3.4] Oct 26 22:02:05 mail postfix-blah/smtpd[59158]: CA9292EE2C0: client=unknown[1.2.3.4]
Continue reading “Postfix – connect from unknown[ip.address]”