I've just setup Zimbra 8 (coming from 5). My 5 configuration was kind of a mess, as I ended up editing config files at times. I'm trying to configure this installation the "right way."

[zimbra@mail ~]$ zmprov gacf | grep zimbraMtaRestriction
zimbraMtaRestriction: reject_non_fqdn_sender
zimbraMtaRestriction: reject_unknown_client
zimbraMtaRestriction: reject_unknown_hostname
zimbraMtaRestriction: reject_unknown_sender_domain

Shouldn't one of these stop these type of connections...?

Feb 20 11:07:48 mail postfix/smtpd[5740]: connect from unknown[]
Feb 20 11:07:48 mail postfix/smtpd[5740]: NOQUEUE: filter: RCPT from unknown[]: <QualityCigars@sliparrive.info>: Sender address triggers FILTER smtp-amavis:[]:10026; from=<QualityCigars@sliparrive.info> to=<jennifer@example.com> proto=ESMTP helo=<00041382.sliparrive.info>

Or is the idea we still let the mail come through and add spamassassin points?