lmtpengine checks for empty message id

[Simon Matter]

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> Hi List
>
> I triggerd an small issue with cyrus-imapd 2.2.12 and the
> lmtpengine.c. Of course it's not a cyrus problem.
>
> I got a very bad mail header from a customer:
>
> Subject: Mailtest
> To: gtest at domain2.ch
> X-Mailer: Lotus Notes Release 6.5.3 September 14, 2004
> From: cm<cm at domain.cht>
> Date: 07-Sep-2005 08:19:55 CEDT
> Message-ID:
> X-MIMETrack: Serialize by Router on skp_bonn/Simon-Kucher(Release7, |
> March 27, 2005) at
> 07.09.2005 08:19:57
> MIME-Version: 1.0
> Content-type: text/plain; charset=ISO-8859-1
> Content-transfer-encoding: quoted-printable
> ...
>
> As you see this mail header is pretty broken. lmtpengine.c checks for
> an empty message id. If it's empty it won't be delivered to the
> mailbox. I'm sure that is correct.
>
> Postfix with lmtp sends the correct error message:
> Sep  7 10:06:58 mail2 postfix/lmtp[85322]: 44D495C161:
> to=<gtest at domain2.ch>, relay=mail3.domain.ch[xxx.xxx.xxx.xxx],
> delay=0, status=bounced (host mail3.domain.ch[xxx.xxx.xxx.xxx] said:
> 554 5.6.0 Message contains invalid header (in reply to end of DATA
> command)).
> Exim with cyrus delivery returns: Error code 65. This looks a bit
> strange.
>
> But since postfix and exim delivers this "broken" mail to cyrus
> without any problem I starting to think if cyrus does not make to
> many RFC checks. We know the world is not perfect.
>
> Anyway, are there any site effects if I remove the check on line 722
> and 723 in lmtpengine.c?
> } else if (body) {
>          r = IMAP_MESSAGE_BADHEADER;  /* empty message-id */

I've been hit by the same problem recently. This is what I added to
/etc/postfix/header_checks to fix the broken mnessages:

# Remove empty Message-ID headers from broken Notes implementation
/^Message-ID:[[:space:]]*$/ IGNORE

Regards,
Simon

>
>
> Regards
> Thomas
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