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4. It is possible to whitelist in spamassassin based on sender domain. However, sender domain is frequently abused by spammers, and this will increase the volume of spam non-trivially.
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I'm still evaluating Zimbra, but I currently I do this on my existing postfix box:
In main.cf:
smtpd_sender_restrictions = permit_mynetworks,
permit_sasl_authenticated,
reject_non_fqdn_sender,
reject_unknown_sender_domain,
check_sender_access hash:$config_directory/access,
hash:$config_directory/sender_checks
And in sender_checks :
# mail from these will be discarded if they do not come from $mynetworks
# except for the loophole created by SASL authentication
.my.domain.com REJECT are you spoofing
So, to retain this functionality I was expecting to setup an SMTP gateway that all mail will be fed through. I'll also have to make sure this gateway can validate addresses an aliases stored in the Zimbra server via LDAP. I'm assuming (*hoping*) that will be possible.