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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: Dumplicated 'To' fields
Date: Mon, 02 Jun 2003 23:23:16 +0200
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Jesper Harder <harder@myrealbox.com> writes:

> Simon Josefsson <jas@extundo.com> writes:
>
>> Xavier Maillard <zedek@gnu-rox.org> writes:
>>
>>> I've recently received what I have seen as a weird mail. In fact the
>>> headers contained two 'To' fields in it. As I am curious on the purpose
>>> of such a method, I've tried by myself using Gnus and it worked.
>>
>> It is valid, so it should work.
>
> Nope, multiple To fields are not allowed, cf. the table in RFC 2822,
> Section 3.6.

RFC 2822 is just a PS, so 822 behavior is still valid, I believe.  See
RFC 2822 4.5 for the obs-to field definition, which is identical to
the to field definition, but can occur several times.