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Re: [Fwd: I-D ACTION:draft-moore-mail-nr-fields-00.txt]

2004-09-28 15:54:43

Philip Hazel wrote:

Exim does not deliberately modify message headers or message bodies
apart from the required minimum such as adding Received: and translating
CRLF into LF for local storage. I am firmly of the opinion that messing
around with message content is not the job of an MTA. There is
definitely no code for folding header lines in Exim. I have just double-
checked by sending a message with a References: line that was over 1,000
characters long. (I am the author of Exim, incidentally.)

It is possible for a sysadmin to configure Exim to remove and add header 
lines. It is probably possible to try to make it fold by a sufficiently
hacky configuration, but that's the fault of the writer of the 
configuration, not Exim. I suspect that some other software is involved
at your ISP.

Yes, I should have been more clear. It is certainly possible that
the ISP has modified Exim, or that it is invoking some external
program that is modifying the message. Or it may be a version
issue; the SMTP greeting line emitted is

220 smtp02.mrf.mail.rcn.net ESMTP [NO UCE] RCN Exim 3.35 #7 Tue, 28 Sep 2004 
18:41:40 -0400

and the Received field from the modified list message was:

Received: from 65.105.220.34.ptr.us.xo.net ([65.105.220.34] 
helo=mail.blilly.com)
        by smtp02.mrf.mail.rcn.net with asmtp (Exim 3.35 #7)
        id 1CAHhO-0002LQ-00; Wed, 22 Sep 2004 20:43:02 -0400

which appears to identify the same (somewhat old) version of Exim.

I am certain that the problems identified don't happen before
messages get to that ISP from here (and it's certainly not an
MUA issue), and it appears that the added exclamation point
happened somewhere after that ISP.


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