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From: Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai =?iso-8859-1?q?Gro=DFjohann?=)
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Subject: Re: Sender header?
Date: 24 May 2001 15:11:39 +0200
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On Wed, 23 May 2001, Stainless Steel Rat wrote:

> * Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai Gro=DFjohann) on Wed, 23 May
>   2001
> | Proposal: by default, don't add a Sender header if the message does
> | not contain a From header.
>=20
> This case is fundamentally flawed.  There are times when a Sender
> header MUST be generated by the MUA before the message is handed to
> the MTA.  This cannot be done correctly unless a From header exists.
>=20
> Or do you mean that Gnus should automatically generate a From header
> at the time of sumission instead of generating a Sender header?  I
> think this is dangerous because if Gnus already generates bad Sender
> headers, it is going to generate equivalently bad From headers.

By default, Gnus creates a From header for all outgoing messages.
This is because From is mentioned in message-required-mail-headers and
message-required-news-headers.

> | Don't add a Sender header if the message contains a From header
> | which is equal to the value computed automatically (for folks with
> | message-generate-headers-first set to t).
>=20
> Correct.  RFC 2822 qualifies this as a "SHOULD NOT" case.  It is
> allowed but discouraged to have duplicate From and Sender field
> mailboxes.  Note that Sender MUST be a single mailbox whereas From
> may be many.
>=20
> | Only add a Sender header if the From header is different from the
> | normal value.
>=20
> This is what Gnus does now, yes?

No.  As you can see in this message, Gnus automatically adds a Sender
header.  I have changed the variable user-mail-address.

kai
--=20
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