[SunHELP] Mail bounce problem

[Matthew Braun]

Problem solved. It was my MX record.
The MX record was set to an IP address rather than a host name, so some
sites that were doing reverse lookup queries were failing and getting
all confused. Changing it to a hostname solved the issues. Geh.

Thanks for the help!

===========[b l i x]============
"Rub the bee. Rub the bee.
Keep rubbing the bee or damn
  your eyes, your life is ashes.
YOUR LIFE IS ASHES."
================================ 

> -----Original Message-----
> From: sunhelp-admin at sunhelp.org 
> [mailto:sunhelp-admin at sunhelp.org] On Behalf Of Javier O. Augusto
> Sent: Tuesday, April 09, 2002 2:04 PM
> To: sunhelp at sunhelp.org
> Subject: Re: [SunHELP] Mail bounce problem
> 
> 
> On Tue, 2002-04-09 at 10:40, Matt Braun wrote:
> > Hey all.
> > 
> > I'm having trouble with some, but not all, outbound and 
> inbound mail. 
> > When mail is sent to us from certain external sites (erols 
> being one 
> > of them), it bounces. When we try to send mail to them we get:
> > 
> >    ----- The following addresses had permanent fatal errors ----- 
> > <vahfma at external.com>
> > 
> >    ----- Transcript of session follows -----
> > ... while talking to mx.mail.rcn.net.:
> > >>> RCPT To:<vahfma at remotesite.com>
> > <<< 550 cannot route to sender address <mjbraun at internal.com> 550 
> > <vahfma at external.com>... User unknown
> > 
> > This is on a Solaris 8 box running Sendmail version 8.9.1
> > 
> > The mail server has a private ip address and is behind a firewall 
> > (fire.internal.com). The firewall's IP is in the MX record for 
> > "internal.com" but it forwards port 25 to the actual server 
> > "triumph.internal.com". In the sendmail.cf for triumph, 
> masquerading 
> > is enabled as "DMinternal.com". Users are using Outlook to send and 
> > receive mail internally, and it's the only mail server.
> > 
> > 
> > Note: I am not the designer or builder of this network; I 
> just get to 
> > fix it.
> > 
> > What could be going wrong here?
> 
> I think you shouldnt be masquerading since your firewall is 
> portforwarding requests on 25 to your internal server. that's 
> my 5c tip.
> 
> javier
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