bug#51733: 27.1; Detect impossible email addresses better

[Lars Ingebrigtsen]

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"

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

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

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

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