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.
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