IMail (8.15) appears not to put the PTR results in the "normal" place. The two examples below show a Recieved header from a sender with valid DNS entries and another with totally bogus information. I can't tell them apart except by running a dig -x on each.
Does IMail do ANYTHING with PTR? How can I use this?
PTR is the DNS type for a reverse DNS entry, which supplies a hostname for an IP address. So the PTR record for 192.0.2.25 might be smtp.example.com.
IMail cannot alter the PTR record (either yours or anyone else's).
Bad Header:
Received: from rnaiewno.com [66.0.118.65] by visioncomm.net (SMTPD32-8.15) id A940495001E; Thu, 05 May 2005 11:18:24 -0400
Good Header:
Received: from dazed.lightbridge.com [206.35.13.66] by visioncomm.net with ESMTP (SMTPD32-8.15) id AD4A8D30072; Thu, 05 May 2005 11:35:38 -0400
Definition: "Normal" place; a la sendmail
Received: from <helo> (<rdns>[<ip>]) by <us> ... or Received: from fsmail432.com (H1b65.h.pppool.de [85.72.27.101]) by xanadu.evi-inc.com ...
It sounds like you are looking to see the PTR record in the headers. IMail doesn't do that (although certain addon products will <G>).
IMail shows "Received: from <helo> [IP] by ..." in the Received: header. There are few requirements for what goes in the Received: header, but normally at a minimum there is the HELO hostname and the IP address in brackets. Some mailservers do less, some do more -- such as the example you show that goes a step further and does the reverse DNS lookup, and adds it in an SMTP comment.
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