bug#51733: 27.1; Detect impossible email addresses better

[Andreas Schwab]

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?=

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

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

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

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."