[wplug] Email bounce problem

[Larry Daberko]

Hi,
	I wanted to see if anyone else had this experience and could tell me 
where to start looking.

	I'm running a qmail server for my company and when a customer sends us 
an email, sometimes it bounces back and they see:

> 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. 

What's throwing me off is the unknown user and relaying denied seems to 
be two different error messages.  I've verified via logs that this 
message never reached my server.  My server sends this format for 
unknown users:

> Hi. This is the qmail-send program at mail.mycompany.com.
> I'm afraid I wasn't able to deliver your message to the following addresses.
> This is a permanent error; I've given up. Sorry it didn't work out.
> 
> <nobody at mycompany.com>:
> Sorry, no mailbox here by that name. (#5.1.1)
> 
> --- Below this line is a copy of the message.

which is different that the one above.

I suspect that one of the hosting company's servers has a relay server 
that's misconfigured.

LBD