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They accept a manual connection from our IP. I would be surprised if they didn't, we have nearly 10,000 aol addresses on our db and manage to deliver to most.

I don't think that was it. I checked our logs for just "TempFail" over the last 2 weeks and found 27 instances, all to AOL addresses, and with 12 different AOL mailserver IP addresses. No correlation with time of day either - we got them at 8am when we are quiet as well as our peak periods...

Don't think that's the answer - I've looked for the 'TempFail' in our logs and found 27 over the last 2 weeks (the time we keep this level of detail). All were to different aol.com addresses and from half a dozen different aol mailservers. No clues in the time of day either, times were...

Hmm - interesting 'stab'. I'll have a look and let you know. Cheers, Nick

Thanks for the quick response! I will pm our IP and other details that I have anonomised below. timeLogged orig rcpt|dsnAction|dsnStatus|dsnDiag|dsnMta|bounceCat|srcType|srcMta|dlvType |dlvSourceIp dlvDestinationIp dlvEsmtpAvailable dlvSize queue 28/09/2012...

I do, but, what would you do with something like failed,5.0.0 (undefined status),"smtp;521 5.2.1 ""TempFail"" This address (an aol.com address) was regularly receiving emails without a problem until this one pops up. The address itself is valid. Our service is pretty 'clean' (own IP...