Duplicate header field: "MIME-Version" in Read Receipts
Steve Scotter via amavis-users
amavis-users at amavis.org
Mon Nov 18 18:16:25 CET 2013
Spectrum Computer Solutions
331 Ansty Road
T. 07980 861013
F. 02476 619383
info at spectrumcs.net
# uname -a
FreeBSD crimson.spectrumcs.net 9.1-RELEASE-p4 FreeBSD 9.1-RELEASE-p4 #0: Mon Jun 17 11:42:37 UTC 2013
# amavisd -V
# perl -V
Summary of my perl5 (revision 5 version 14 subversion 4) configuration:
Over the past few months I've been receiving a lot of requests from staff to release email which has been marked as [INVALID HEADER] due to 'Duplicate header field: "MIME-Version"'.
When I take a look at the messages I see they're read receipts relating to an email a staff member has sent. (the subject has a READ: prefix).
The examples I can remember have been from large financial institutions in the UK so getting though to their IT department is unlikely from my position as a SMB IT Support person.
A censored example is available at http://pastebin.com/1qXP5suv
To my untrained eye I believe there are too many MIME-Version: 1.0 headers (lines 33 and 50) but I'm unsure if this is a problem specific to this group of senders or a wider problem. I can see from the headers that the senders organisation is using a exchange server but I can't tell what version (perhaps a incompatibility with the latest version?). Is anyone else having similar problems?
Also, is it possible to somehow prevent Amavisd sending notifications for 'Duplicate header field' against only "MIME-Version"' (eg, I still want 'Duplicate header field: "Subject"' notifications) and what would be the implications? Could anything malicious sneak though?
(I have full policy configuration backed by MySQL database)
T. +44 (0) 7970 463925
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