>>From the outgoing headers of :
>x-sender: [EMAIL PROTECTED]
>x-mailer: Claris Emailer 2.0v3 p3, January 22, 1998
>
>The mail server is that .6 IP number, and also known as "64.164.81.106 "
>and it's obviously behind the same router we are. The error message we
>see in the mail server logs is: 
>
>Failed to deliver to '[EMAIL PROTECTED]'
>SMTP module(domain davinci-selectwork.com) reports:
> host gate2.agencynet.de says:
> 553 5.1.8 <[EMAIL PROTECTED]>... 
> Domain of sender address [EMAIL PROTECTED] does not exist

I don't think it is actually the X-Sender line that is really at fault, 
so much as the info contained in there, well, is invalid. 192.168.1.6 is 
not a valid mail server address (in terms of spam protection). Not only 
is it not an address that has an MX record that can be verified, but it 
is also an non routable IP address. All around, it screams spammer.

The best bet is to fix the problem at the client end that is inserting 
that IP. I'm guessing your account is setup using IPs instead of DNS. If 
you can't use DNS to access your mail server (internal network and no DNS 
server), use the Hosts file in the Mac OS to fake it. That will let you 
put a DNS entry into Emailer, and have it translated to the internal IP 
behind the scenes (think of Hosts files as local DNS servers).

-chris
<http://www.mythtech.net>

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