Hi Scott:
I have been holding mail that has an invalid MAILFROM - based on the theory
that it makes no sense delivering email if the recipient is NOT given an
opportunity to reply to it.
However, I now realize that my "militant" position is weak because of how
MAILFROM only inspects the envelope - NOT the headers. Also, it only checks
the FQDN not just the 2nd level domain name. Neither is a BUG - but it
limits the usefulness of the test.
Here is a good example - the envelop "from" contains a host name - but the
header "from" contains a valid email address. The recipients mail software
would use the header from and thus allow the recipient to reply to this
message:
11/29/2001 20:40:25 Qe37d174 Msg failed MAILFROM (Domain
ALANTNOTE.passportcorp.com has no MX/A records.).
11/29/2001 20:40:25 Qe37d174 Msg failed REVDNS (This E-mail was sent from a
mail server with no reverse DNS entry.).
11/29/2001 20:40:25 Qe37d174 Subject: Read: Performance 2000 Information
11/29/2001 20:40:25 Qe37d174 From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
But, when you look at the header, you'll see that a valid from/reply-to is
present. And the 2nd level domain name "passportcorp.com" would have been a
valid MAILFROM.
Received: from mailhost.passportcorp.com [63.84.125.200] by
mail.webhost.hm-software.com with ESMTP
(SMTPD32-7.04) id A37D2A40174; Thu, 29 Nov 2001 20:40:13 -0500
Received: by mailhost.passportcorp.com from localhost
(router,SLMail V5.1); Thu, 29 Nov 2001 20:40:11 -0500
for <[EMAIL PROTECTED]>
Received: from ALANTNOTE [192.0.1.46]
by mailhost.passportcorp.com [192.0.1.3] (MailWarden 5.1.0.1059 (SLmail
Add-On Edition)) with SMTP
id 88B2D24B60714704806D8F4AA3388287
for <[EMAIL PROTECTED]>; Thu, 29 Nov 2001 20:40:11 -0500
From: "Alan Tonnesen" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Subject: Read: Performance 2000 Information
Date: Thu, 29 Nov 2001 20:40:10 -0500
Message-ID: <001601c1793f$f2f30d40$2e0100c0@PASSDEV>
MIME-Version: 1.0
Content-Type: multipart/report;
report-type=disposition-notification;
boundary="----=_NextPart_000_0017_01C17916.0A201280"
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0)
Importance: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000
In-Reply-To: <[EMAIL PROTECTED]>
X-SLUIDL: 9A1DF51B-4ECC4782-89B78F8D-9BCF8DB4
X-Declude-Sender: [EMAIL PROTECTED] [63.84.125.200]
X-Declude-Spoolname: De37d174.SMD
X-Declude-Note: Processed by Declude 1.28; remote host [No Reverse DNS]
Best Regards
Andy Schmidt
Phone: +1 201 934-3414 x20 (Business)
Fax: +1 201 934-9206
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