Comcast and mail header errors?

[Bruce Dawson]

Paul Lussier wrote:
> Bruce Dawson <jbd at codemeta.com> writes:
> 
>>Paul Lussier wrote:
>>
>>>The one that prompted me to send this query was from Bruce's
>>>server...  I didn't really want to put his IP address and server name
>>>in an e-mail which will likely be indexed by every conceivable search
>>>engine :)
>>
>>Upon seeing my name, my "ears" perked up...
>>
>>I suspect Comcast isn't doing a double-reverse DNS lookup of the other
>>end of the connection. So it is probably seeing mail.gnhlug.org in the
>>header, but getting the "real" host name when it reverse look-ups the IP
>>address.
> 
> 
> Bizarrely enough, the mail that comes in from via the gnhlug list looks fine:
...
> Yet, messages from you personally, do:
> 
>   Received: from mail.comcast.net [204.127.198.10]
>         by localhost with POP3 (fetchmail-6.2.5)
>         for pll at localhost (single-drop); Mon, 20 Mar 2006 14:21:23 -0500 (EST)
>   Received: from linux.codemeta.com (pm.codemeta.com[199.125.76.1](misconfigured sender))
>         by rwcrmxc22.comcast.net (rwcrmxc22) with ESMTP
>         id <20060320192048r22002i0dpe>; Mon, 20 Mar 2006 19:20:48 +0000
>   X-Originating-IP: [199.125.76.1]
>   Received: from [192.168.56.3] (bruce.localnet [192.168.56.3])
>         by linux.codemeta.com (8.12.8/8.12.8) with ESMTP id k2KJKkUr030847
>         for <p.lussier at comcast.net>; Mon, 20 Mar 2006 14:20:46 -0500

Oh! That...

I haven't figured out how to get sendmail to bind to a specific source
address.

Any ideas? There doesn't appear to be anything in sendmail.mc, and can't
find anything in the [abundant] documentation.

--Bruce