bug#51733: 27.1; Detect impossible email addresses better

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Does textsec-email-suspicious-p expect non-ASCII email addresses to be
> RFC 2047 encoded?

Yes.  

> If so, it will not work in the Rmail display buffers, where email
> addresses are shown decoded.  For non-ASCII names the function signals
> an error.

Rmail does have access to the encoded header, so it'll just have to call
the textsec function before it decodes it (and displays it).

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