Not receiving Mails


Not receiving Mails

Postby gaurms » Mon, 24 Apr 2006 16:08:19 GMT

Recently we have developed a strange mail problem.
We have an IPtables firewall running on Lunux machine. We have one DNS
server running in the NAT'ed LAN(internal IPs) and second DNS server is
running in DMZ on an external IP.
Mail server is behind the Firewall (which forwards all mail traffic to
the mail server behind the forewall).  Firewall gateway is running DNS
Very recently we lost DNS in DMZ and since then we are able to send
mails from our mail server to outside world but have stopped receiving
the mails.
Within internal LAN machines we are able to send and receive the mails.
How to debug and address the problem? I tried CLI session based mail
transfer to our mail server (by ssh'ing the extrnal IP and running the
sendmail commands, the mail is delivered in the user account behind
firewall.). But when we try sending through any external mail
servers(yahoo, gmail etc.) they produce error!
Is it s problem of DNS or something else? Where can we find the logs of
any messages?
Thanks for any help

Re: Not receiving Mails

Postby Rob MacGregor » Mon, 24 Apr 2006 17:52:03 GMT

And the error is?

You've provided *NO* information to assist in debugging.  It's easy to provide
guesses, but that's all they would be.

You need to provide the error that you're seeing.  Details of your domain
would be useful too.

  Rob MacGregor (BOFH)        Oh my God! They killed init! You bastards!

This landing is gonna get pretty interesting.
	Define "interesting".
Oh God, oh God, we're all going to die?

Re: Not receiving Mails

Postby Ingo » Mon, 24 Apr 2006 19:09:21 GMT

 XXXX@XXXXX.COM  schrieb:

More information needed for analysis.
You might find the log files in /var/log and they are called mail or maillog


Re: Not receiving Mails

Postby Gavin Wright » Tue, 16 May 2006 00:08:53 GMT

I agree with what everyone else has said so far.  Not enough 
information.  But what I am thinking, if you lost your DNS in the DMZ 
with an external IP - was that the authoritative DNS server for your 
domain?  If so - then you most likely lost your MX record too.  Which 
means that you aren't receiving e-mails because mail servers don't know 
where to send them.  So I would think that is problem #1.

The problem with not being able to "smart host" your messages through 
external mail servers, you will need to provide us with more info.  Like 
everyone said, log file entries.

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