Any connecting SMTP connection must submit a HELO or EHLO.  I believe that IMail uses the HELO/EHLO name given as the part of the Message-ID after the @ symbol, but will only insert this if there is no Message-ID already present (which would also fail SPAMHEADERS in Declude unless LOOSENSPAMHEADERS ON is set).  If there is an line break here, that data must be bad.  If you look in your IMail log for the information about the session (and turn up the logging), you should be able to see the HELO/EHLO name given.

FYI, this wouldn't be the first IIS plug-in that had RFC issues.  Many have them.  I can't say for sure 100% though that this is the case here due to circumstances, but I strongly suspect this is the trigger.  If IMail acted properly, the message would have been rejected, and that's not a solution to your issues either, so the fix is likely best applied to your mailer.

Matt



Harry Vanderzand wrote:
Thanks Matt
 
This message comes straight from a form submission on one of my servers.  I think aspmail is being used.  My programmer says that it can't be caused by that and is blaming the SMTP server it is submitted to, which is my imail server
 

Harry Vanderzand
inTown Internet & Computer Services
519-741-1222

 


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Matt
Sent: Thursday, June 15, 2006 3:27 PM
To: [email protected]
Subject: Re: [Declude.JunkMail] malformed message-id

Looks like an IMail inserted Message-Id header, so in part it is their problem.  I suspect that the trigger though is the sender having an invalid HELO, which IMail is then mishandling.  It could have also been a hickup unless it is repeatable with the same source.

The HELO, MAIL FROM and RCPT TO should all have only US-ASCII printable characters (excluding space).  Anything beyond that is invalid on it's own, and IMO, the MTA should issue a 5xx error when received indicating as much.

Matt



Harry Vanderzand wrote:
 
I am having a problem where the message-id is malformed which trips up some clients.

see:

Message-Id: <200606131300275.SM04448@
>
X-Declude-Sender: [EMAIL PROTECTED] [216.16.233.16]

Notice the the closing bracket is on a separate line. This causes the headers to become part of the body for some of my clients.

Has anyone seen this before?  Is it an imail issue or a declude issue?

Harry Vanderzand
inTown Internet & Computer Services
11 Belmont Ave. W., Kitchener, ON,N2M 1L2
519-741-1222

 

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