bug#51733: 27.1; Detect impossible email addresses better

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> I think I get it now: it's because of textsec-suspicious-nonspacing-p,
> which forbids consecutive nonspacing characters, right?

Yup.

> But then I don't think it's correct to consider Cf characters for that
> purpose: UTS#39 explicitly talks about nonspacing _marks_, i.e. Mn and
> Me characters.  Where did you see Cf and Cc as well?

Good catch; I'll amend the code and test.

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