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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: Dumplicated 'To' fields
Date: Tue, 03 Jun 2003 00:38:51 +0200
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Simon Josefsson <jas@extundo.com> writes:

> Jesper Harder <harder@myrealbox.com> writes:
>
>> Simon Josefsson <jas@extundo.com> writes:
>
>>> It is valid, so it should work.
>>
>> Nope, multiple To fields are not allowed, cf. the table in RFC 2822,
>> Section 3.6.
>
> See RFC 2822 4.5 for the obs-to field definition, which is identical
> to the to field definition, but can occur several times.

Ah, yes you're right -- it's obsolete, but clients should still be
able to interpret it.