Ben McGinnes wrote:
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@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?
Yes it is
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.
Correct - thanks for the pointers on how to track it down - so now my question is how do I set things up to simply try this once and then drop it, rather than queue it up for the next five days with all the attendant dns errors. This is definitely at the boundaries of my mail setup experience - for some reason the other two mail servers I run do not seem to get the same level of spam and thus I seldom notice this.
Regards, Ben
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