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From: Simon Josefsson <jas@pdc.kth.se>
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Subject: rfc2047-default-charset?
Date: 16 Oct 1998 17:01:49 +0200
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rfc2047-default-charset defaults to 'iso-8859-1, which result in
headers containing characters with this encoding is not rfc2047
("encoded word") encoded.

What are the reasoning behind the default?  Mail to certain
destination (MDA-specific, not MTA-specifc) bounce with "Data format
error", because of the 8 bit characters in the header.

Is there a (standard) MIME header that Gnus can add to tell servers
what character set were used in the 8-bit headers?

IMHO rfc2047-default-charset should default to 'us-ascii. This way
Gnus never sends out thoose 8-bit header characters, whoose encoding
can't be determined by clients/MDAs.