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New to the forum but have been using this current set up for well over a year with no problems but here recently have found that postfix-2.6.6 is randomly rejecting incoming emails with the
Recipient address rejected: User unknown in relay recipient table; email@example.com
This happened on three different users for about an hour, and then those same emails went through without a problem.
Currently we have Post fix, Mail Scanner, Clam AV, and Spam Assassin set up, however since none of the e-mails in question made it past Post fix I am not sure that makes a difference.
Also I know that no changes have been made to the e-mail system in months, no add/delete of email accounts. So I am wondering if anyone has run into this type of issue before.
Let me know if there are any logs that might be helpful in figuring this out
Funnily enough, I've been having similar issues. When I tried to take my new servers live, I found that random emails would be rejected as "unknown recipients" even though the recipients most certainly were known.
SInce then I've tried setting up a local MySQL instance on each server in the group and replicating the tables - on the assumption that every now and then a query is failing and having a local DB should improve things. Haven't had chance to test it yet.
I couldn't find any errors (or indeed anything relevant) in the logs.
We have a recipient table that is created and pushed to the server for postfix to read from. So I know that there should not be an issue with a Query or anything like that. Also it only happened to 3 people and the other emails that came in were fine. I am glad to know that I am not the only one that this is happening too.