bug#51733: 27.1; Detect impossible email addresses better

[Robert Pluim]

>>>>> On Wed, 19 Jan 2022 15:24:54 +0100, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Robert Pluĭm <rpluim@gmail.com> writes:
    >> Double fun. Iʼd manually rfc2047 encoded that before sending it, so
    >> either gnus or Gmail encoded it again :-)

    Lars> Of course it was encoded again -- =?utf-8?Q?Plu=C4=ADm?= is a 
perfectly
    Lars> fine, if unusual, name.  😀  I think it's Bobby Table's brother?

Or his cousin.

Based on the message buffer I have, gnus didnʼt encode it again, so it
must have been gmail. Of course that header was ascii-only, so why did
they encode again?

What did the From: look like on the message you've just replied to?
Gnus should not have encoded it, and it contained utf-8 in the display
name.

Robert
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