Its also possible, presuming there are two DNS service for the
domain in question, that one of them is broken/unresponsive, and the
other is not. 'dig' is your friend in tracking the problem down..
On Tue, 7 May 2002, Justin Bloom wrote:
> Hi All,
>
> I have been suffering from a problem recently with e-mail's to one of the
> exim mail servers I administrator rejecting mail with the following
> message: -
>
> This message was created automatically by mail delivery software (Exim).
>
> A message that you sent could not be delivered to one or more of its
>
> recipients. This is a permanent error. The following address(es) failed:
>
> <snip> Valid E-Mail Address (this has been checked)
>
> unrouteable mail domain "<snip>"
>
> The problem occurs with multiple different servers so it is not just with
> communication with a single server. What I have noticed is that if the
> message is sent again it successfully manages to reach the target system. I
> believe that the cause of the problem maybe that the DNS is taking to long
> to be retrieved by the mail server and that exim is rejecting it as it times
> out before the DNS query is answered as it also appears to be a problem only
> with systems that are not e-mailed regularly. This could be particularly
> true as at the moment the server resides on a low bandwidth line which is
> heavily used.
>
> My question is can I extend the time that exim waits for a DNS query to be
> returned or get it to retry a few times before bouncing the message back to
> the user who the message originated from? Or alternatively if anyone thinks
> it may be caused by something other than this I would be glad to hear any
> suggestions on how to resolve this issue.
>
> Regards,
>
> Justin Bloom
>
>
>
>
> --
>
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>
>
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