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From: Florian Weimer <fw@deneb.enyo.de>
To: Richard Earnshaw <Richard.Earnshaw@arm.com>
Cc: Richard Bradfield <bradfier@fstab.me>, overseers@gcc.gnu.org,
 gcc@gcc.gnu.org, gfortran <fortran@gcc.gnu.org>
Subject: Re: List-Id header being stripped
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Date: Mon, 09 Mar 2020 12:32:18 +0100
In-Reply-To: <83220a84-f9af-ab88-b915-cbc28a88311c@arm.com> (Richard
 Earnshaw's message of "Mon, 9 Mar 2020 10:49:14 +0000")
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* Richard Earnshaw:

> On 09/03/2020 10:30, Florian Weimer wrote:
>> * Richard Bradfield:
>> 
>>> It appears that since the migration (or whatever happened on the list
>>> over the weekend), the List-Id header is also being stripped from
>>> outbound mail. The last GCC mail I have where the header is intact was
>>> from Friday 6th.
>> 
>> There weren't any List-Id headers before the migration. 
>
> Yes there were (either that or the filters I've been using for years 
> were psychic!)

Oh, right. They were added in 2006, after I had set up my filters
apparently. 8-/

So the difference is

List-Id: <gcc.gcc.gnu.org>

vs

List-Id: Gcc mailing list <gcc.gcc.gnu.org>

I guess now you need to perform a substring match.