GNU bug report logs - #53412
27.1; sendmail does not wrap overlong lines

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Package: emacs;

Reported by: Francesco Potortì <pot <at> gnu.org>

Date: Fri, 21 Jan 2022 15:18:02 UTC

Severity: normal

Tags: moreinfo

Found in version 27.1

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Francesco Potortì <pot <at> gnu.org>
To: 53412 <at> debbugs.gnu.org
Subject: bug#53412: wrappin text lines is not enough, headers shoould be split too
Date: Mon, 07 Mar 2022 13:35:52 +0100

I just discovered that checking overlong text lines is not enough.

Apparently calling mml-to-mime is not enough when the overlong line is a header.

If there is an overlong header, other headers which are utf-8 escaped are not sent correctly, and the recipent sees something like this:

Subject: test =?utf-8?Q?=C3=A0?= b c
 =?utf-8?Q?=C3=AC?=

RFC 5322 mandates header line lengths less than 998, including CRLF, and this is apparently not enforced by mml-to-mime.  Sending an identical email with long headers split into several lines makes the problem disappear.

I do not know where the culprit is and I do not have a workaround :(
This bug report was last modified 3 years and 72 days ago.

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