Been trying to figure this out...
On a shared ip, I have one domain that, when someone tries to mail to it, they get a bounce saying:
Final-recipient: rfc822; (username)@(domainname).org Action: failed Status: 5.1.1
and I get a 'Relay access denied' message in the maillog. Like this:
I've checked the dns (and the connection is making it to the server), it appears ok.
All the other domains are receiving ok. I don't see anything that I've set differently for this one.
In a "could this be related?"... the shared ip this domain was blacklisted on trendmicro's dul list a few days ago. I wrote them and they said the issue was rdns related (getting the rdns pointed to my server was on my list, but I had not done that yet). I wrote back and they removed me from the blacklist, and I contacted my host and the reverse dns is being set.
However, even after being removed from the blacklist (I have confirmed this), I'm still getting the 'relay access denied' message, and just on that one domain. If they had blacklisted, wouldn't it affect all the sites on that ip?
Would postfix have access to the blacklist and have caused a block somehow, I had assumed only spamassassin would do that, after the email was accepted. If postfix does check blacklists, is there a way to have it's cache flushed? I did have postgrey on, but that is disabled right now until I can fix this, just to make sure it wasn't doing anything.
Thanks for any thoughts you can provide on this, cause I'm lost on finding a solution...