On 17/11/10 7:26 AM, Rob Kampen wrote: > >>> Examining the postfix queue with postqueue -p: I see many >>> (Host or domain name not found. Name service error for >>> name=bdgiedjhea.po6e4ina.com type=MX: Host not found, try again) >>> Jake at bdgiedjhea.po6e4ina.com >>> My question - why does this stay in the message queue - why not dumped >>> back with message undeliverable or dropped? What is the complete output of postqueue -p? What is the From address and, more to the point, is it MAILER-DAEMON? > Agreed, however this opens a potential DoS attack vector - I'm > trying to determine why my postfix even has these requests present > as I'm not initiating the emails (as far as I know) and I do not > forward emails for any other domains. > I feel like I'm missing something......confused maybe It could be backscatter. Run postqueue -p and pick one of the messages, it shouldn't matter which. Then run: postcat -q $MSGID | less Where $MSGID is one of the messages in the queue. That will show you the message and headers. I'd be willing to bet it's your server trying to send a rejection/spam detection to a server. Regards, Ben -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 259 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20101121/3191f82e/attachment-0005.sig>