bug#51733: 27.1; Detect impossible email addresses better

[Andreas Schwab]

On Jan 19 2022, Lars Ingebrigtsen wrote:

> There's no scanning -- rmail displays the From header, right?  So it
> does decoding before displaying the header.  It has to do the textsec
> stuff first, too.

I don't think it makes sense to run the textsec check on the encoded
address, since that will always be ASCII-only.

-- 
Andreas Schwab, schwab@linux-m68k.org
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