Comcast and mail header errors?

[Paul Lussier]

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:

  Received: from mail.comcast.net [204.127.198.10]
        by localhost with POP3 (fetchmail-6.2.5)
        for pll at localhost (single-drop); Tue, 21 Mar 2006 14:32:08 -0500 (EST)
  Received: from rogue.codemeta.com ([199.125.75.14])
        by rwcrmxc13.comcast.net (rwcrmxc13) with ESMTP
        id <20060321193128r1300joj0ve>; Tue, 21 Mar 2006 19:31:43 +0000
  X-Originating-IP: [199.125.75.14]
  Received: from rogue.codemeta.com (IDENT:H8ELiJubabETzVDZOO9fas2SHkjOA613 at localhost.localdomain [127.0.0.1])
        by rogue.codemeta.com (8.11.6/8.11.6) with ESMTP id k2LIW6m07430;
        Tue, 21 Mar 2006 13:32:06 -0500
  Received: from linux.codemeta.com (pm.codemeta.com [199.125.76.1])
        by rogue.codemeta.com (8.11.6/8.11.6) with ESMTP id k2LIVMm07400
        for <gnhlug-discuss at mail.gnhlug.org>; Tue, 21 Mar 2006 13:31:23 -0500
  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 k2LIVLUr001321
        for <gnhlug-discuss at mail.gnhlug.org>; Tue, 21 Mar 2006 13:31:21 -0500

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
-- 

Seeya,
Paul