[CentOS] Postfix - message queue filling with Host or name not found - try again

Indunil Jayasooriya indunil75 at gmail.com
Sun Nov 21 22:54:08 EST 2010


Pls add bdgiedjhea.po6e4ina.com <Jake at bdgiedjhea.po6e4ina.com> to /etc/hosts
file

and , then add bdgiedjhea.po6e4ina.com <Jake at bdgiedjhea.po6e4ina.com> to
mydestination parameter in /etc/postfix/main.cf file

mydestination = $myhostname, localhost.$mydomain, localhost,
bdgiedjhea.po6e4ina.com <Jake at bdgiedjhea.po6e4ina.com>


then, restart postfix.

That't it.




On Mon, Nov 22, 2010 at 9:17 AM, Rob Kampen <rkampen at kampensonline.com>wrote:

> 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 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?
>>
>>
> 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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-- 
Thank you
Indunil Jayasooriya
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