bug#51733: 27.1; Detect impossible email addresses better

[Robert Pluim]

>>>>> On Wed, 19 Jan 2022 17:08:13 +0100, Andreas Schwab 
>>>>> <schwab@linux-m68k.org> said:

    Andreas> On Jan 19 2022, Lars Ingebrigtsen wrote:
    >> And your address arrived as (wire format):
    >> 
    >> Robert =?us-ascii?Q?=3D=3Futf-8=3FQ=3FPlu=3DC4=3DADm=3F=3D?=
    >> 
    >> which displays as
    >> 
    >> Robert =?utf-8?Q?Plu=C4=ADm?=

    Andreas> Looks like there is a bug in gnus-read-ephemeral-emacs-bug-group, 
as it
    Andreas> shows this header line in the raw article:

    Andreas> From: Robert =?utf-8?Q?Plu=C4=ADm?=
    Andreas>  <rpluim@gmail.com>

    Andreas> The debbugs.gnu.org web interface gets it right, including the
    Andreas> downloadable mbox contents.

The downloaded mbox looks correct, but
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=51733#281

shows

From: Robert =?utf-8?Q?Plu=C4=ADm?=
 <rpluim <at> gmail.com>

for me. And

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=51733#305 shows

From: Robert Pluĭm <rpluim <at> gmail.com>

which I thought Lars said was not allowed?

Robert
--