The parasite, which has a valid-but-useless PTR record, BTW, despite being a
dynamic-IP adsl service, could have been nailed on any one of, or combination
of, of the four faults in acl_smtp_connect alone (C6, C7, C8, C9 are acl
clauses), Black and Brown lists are local lookups, and very short lists.
This caller never entered the 'full' acl_smtp_helo phase, and our server was
never called upon to even give an online acl_smtp_connect rejection message.
It gave up and left of its own accord at T+ 2 minutes 9 seconds after arrival.
Many will not wait even 64 seconds, and some give up even sooner.
No panacea, just one more road to the gulag for the spambots.