bug#47076: 27.1; Unwanted warnings about unqualified recipient addresses from message.el

[Glenn Morris]

Eric Abrahamsen wrote:

> Peter Schultze <petersch@cs.ucla.edu> writes:
>
>> This could be related to bug#23054 

I think it is due to https://debbugs.gnu.org/32639 (ff7560b6ff),
which seems to offer no way to customize what is "invalid".

> You should be able to shut this off by pushing '(bogus-recipient .
> disabled) to `message-syntax-checks'. See the "News Headers" section of
> the Message info manual.

This documentation could be improved:
1) bogus-recipient is not listed as an option
2) it's under "News Headers", yet here it applies to mail