[wplug] Email bounce problem

[Bill Moran]

In response to Larry Daberko <larry at daberko.com>:
> 
> Bill Moran wrote:
> > In response to Larry Daberko <larry at daberko.com>:
> >>
> >>>From: postmaster at hosting.com [mailto:postmaster at hosting.com]
> >>>Sent: Wednesday, June 14, 2006 11:28 AM
> >>>To: user at customer.com
> >>>Subject: Undeliverable Mail
> >>>
> >>>Unknown user: info at mycompany.com
> >>>
> >>>RCPT TO generated following response:
> >>>550 <info at mycompany.com>... Relaying denied
> >>>
> >>>Original message follows. 
> > 
> > Yup.  Do you have any backup MXes configured in DNS?  If so, you need to
> > ensure they all have updated mail address lists at all times.
> > 
> > It could also be on the user's end.  I've frequently had users complain
> > that they couldn't send me email, only to find that they couldn't send
> > email to _anyone_.
> > 
> No backup MXs are specified.  The customer's issue is intermittent. The 
> customer uses a large webhost which uses another party's email servers. 
>   This makes me believe one server in the round robin is misconfigured 
> and there's a bunch of finger-pointing on their end.

Certainly sounds like a possibility.

> Could anyone tell me what software would produce the type of error 
> message?  Exchange or?

That's a pretty generic message.  If I remember correctly, Exchange is
even MORE generic.  The message is something like "The message could
not be delivered" with no additional information.

Check the headers.  Most email software is pretty braggy about putting
a signature in the headers, that includes MTAs.

-- 
Bill Moran
Collaborative Fusion Inc.