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Re: [Emailcore] Ticket #14: G.7.8. Review different size limits

Ned Freed <ned.freed@mrochek.com> Fri, 16 July 2021 15:41 UTC

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Date: Fri, 16 Jul 2021 08:34:35 -0700
From: Ned Freed <ned.freed@mrochek.com>
In-reply-to: "Your message dated Fri, 16 Jul 2021 10:08:15 +0200" <8b551cf1-131b-cf43-5e61-cabf6fb9e2e6@tana.it>
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To: Alessandro Vesely <vesely@tana.it>
Archived-At: <https://mailarchive.ietf.org/arch/msg/emailcore/F1QHB0jeGjYER4VU4A3ookZbkQc>
Subject: Re: [Emailcore] Ticket #14: G.7.8. Review different size limits
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> On Fri 16/Jul/2021 00:19:21 +0200 John Levine wrote:
> > It appears that Viktor Dukhovni  <emailcore@ietf.org> said:
> >>> On 15 Jul 2021, at 4:16 pm, John Levine <johnl@taugh.com> wrote:
> >>>
> >>> PS: I don't feel strongly about lifting the 1000 octet limit but I would like
> >>> to understand how widely it's enforced by mail receivers.
> >>
> >>On the receiving side Postfix does not enforce any physical
> >>line length limits on message body lines, ...
> >
> > I realize qmail isn't very popular any more, although you will find
> > it hiding in the guts of a lot of packaged mail systems.  For incoming
> > messages, it's all dynamic and there's no length limits.  For outgoing
> > messages it politely wraps headers to 80 bytes but leaves bodies alone.


> Courier has similar limits on submission.  Some 100000 for the whole header
> (configurable since 2007, BOFHHEADERLIMIT) and 5000 bytes line length limit.

It's really quite unfortunate that there's no limit specified on header
size, since sending a huge header is yet another way to exhaust resources
on a poorly implemented MTA.

However, adding one is clearly beyond the scope of what we're allowed to
do in emailcore. Even a change to make the limits we have "real" is pushing
it.

				Ned












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