I am running Zimbra 8.0.6_GA_5922.FOSS.

I am having a bunch of trouble with legitimate incoming mail being blocked. Which is funny, because a ton of spam and phishing emails get through with no trouble. The logs show:

Sender address triggers FILTER smtp-amavis

I have turned off antivirus and antispam on the mail server for the time being. This legit mail is still being blocked. I have whitelisted the addresses in /opt/zimbra/conf/salocal.cf.in -- They are still being blocked. The sender's domain isn't blacklisted according to mxtoolbox.

For the life of me, I cannot figure out how to allow the mail through the filter. It really shouldn't be this difficult.

I have also had the client whitelist the sender's domain in preferences within the mailbox, but it is still blocked.

I have walked through many wiki articles trying to solve this, but it either does not work, or sometimes refers to file/folders that I don't even have. Very frustrating.

If someone could just tell me one surefire way to whitelist a domain, I would really appreciate it.