[no subject]

  Find out if it's a particular group black listing them (spamhaus?).
Some of them will blacklist an entire ISP's network because of a client
(or a client of a client in my company's case).

 Your client may be changing ISPs unless they have A LOT of asprin.


Thus spake Nathan J. Underwood (ale1 at cybertechcafe.net):

> A client of mine has recently started using Cbeyond as their ISP.  Since 
> the cutover, they've had problems sending emails to random domains. 
> After digging around a bit, I've found that they seem to be blacklisted. 
>    The error messages that the users are getting were pretty generic, 
> so I started digging further.  My first move was to ping the server 
> reported as the primary MX for the recipient (got a response).  I then 
> tried to telnet to the mail server (i.e. telnet mail.server.net 25), and 
> got an immediate connection refused.  I then tried the same exercise 
> from my ip (not blacklisted), and was able to connect.  They're not an 
> open relay, and I've not been able to find any lists that their listed 
> on.  Anyone got any suggestions on where to look next?
> 
> -- 
> 
> --
> 
> registered linux user # 73046
> _______________________________________________
> Ale mailing list
> Ale at ale.org
&gt; <a  rel="nofollow" href="http://www.ale.org/mailman/listinfo/ale";>http://www.ale.org/mailman/listinfo/ale</a>

:wq!
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