bug#51733: 27.1; Detect impossible email addresses better

[Robert Pluim]

>>>>> On Tue, 18 Jan 2022 20:44:51 +0200, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Lars Ingebrigtsen <larsi@gnus.org>
    >> Cc: 51733@debbugs.gnu.org
    >> Date: Tue, 18 Jan 2022 13:51:38 +0100
    >> 
    >> Lars Ingebrigtsen <larsi@gnus.org> writes:
    >> 
    >> > The next step would be to make other packages use this. 
    >> 
    >> (But I'm taking the rest of the day off, and possibly tomorrow, too, so
    >> if somebody else wants to tinker with this, please do go ahead.)

    Eli> Does textsec-email-suspicious-p expect non-ASCII email addresses to be
    Eli> RFC 2047 encoded?  If so, it will not work in the Rmail display
    Eli> buffers, where email addresses are shown decoded.  For non-ASCII names
    Eli> the function signals an error.

It does? Do you have an example? The following works fine

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"

Robert
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