Postfix – connect from unknown[ip.address]

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]

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