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@xxxxxxxxxxxxxxxxxxxxxxx
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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