Re: [ietf-smtp] CC'ing ticket systems

Valdis Kl ē tnieks <valdis.kletnieks@vt.edu> Thu, 09 July 2020 22:52 UTC

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Sender: Valdis Kletnieks <valdis@vt.edu>
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To: "John Levine" <johnl@taugh.com>
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Date: Thu, 09 Jul 2020 18:52:15 -0400
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Subject: Re: [ietf-smtp] CC'ing ticket systems
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On 07 Jul 2020 20:49:00 -0400, "John Levine" said:

> If I were trying to solve it, I would start with a variation on the
> way mailing list subject tags work, adding the tag if it's not there
> but leaving the subject line alone if it is.

The problem is that many MTA's *already* screw around with the Subject: line to
jam in the listname (because apparently some people *still* can't filter based
on headers other than Subject:) or "this was from outside the organization and
might be a phish" or other nonsense...

<insert .wav of 'Dueling Banjos" here>

Two headers seen on the Educause Security list:

Subject: Re: [SECURITY] [Ext] Re: [SECURITY] [EXTERNAL] Re: [SECURITY]  [EXTERNAL] Re: [SECURITY] [External] [SECURITY] Duo/2FA exemption policies

Subject: Re: [SECURITY] [BULK]  Re: [SECURITY] [BULK]  Re: [SECURITY]  [EXTERNAL] Re: [SECURITY] [BULK]  Re: [SECURITY] Microsoft Defender ATP

At which point, if your MUA doesn't thread based on References: or
In-Reply-To:, you're totally screwed because the meaningful part of the
header is now 2 feet to the right of your screen....

I despair of being able to write an RFC on the topic that won't result
in at least a half dozen organizations Getting It Totally Wrong.