bug#51733: 27.1; Detect impossible email addresses better

[Robert Pluim]

>>>>> On Wed, 19 Jan 2022 10:26:42 +0100, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Robert Pluim <rpluim@gmail.com> writes:
    ELISP> (textsec-email-suspicious-p "rpluimм <rpluimм@gmail.com>")
    >> => "`rpluimм' isn't restrictive enough"
    >> 
    >> Although I think that message should say something like
    >> 
    >> "Mailbox name contains non-ASCII characters"

    Lars> But it's fine for mailbox names to be non-ASCII.

    Lars> (textsec-email-suspicious-p "rpluimм <м@gmail.com>")
    Lars> => nil

    Lars> It's just various combinations of ... things ... that are suspicious.

OK, but the error message could be better, no?

Robert
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