Re: [Exim] RFC 2821 and "headers_sender_verify"/"headers_che…

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Autor: Philip Hazel
Data:  
Para: Suresh Ramasubramanian
CC: exim-users
Asunto: Re: [Exim] RFC 2821 and "headers_sender_verify"/"headers_checks_fail"
On Tue, 15 May 2001, Suresh Ramasubramanian wrote:

> Valid envelope from, and something like autoresponder@dont-reply in the
> from.
>
> At least one ISP I know does that. OK, it's not very elegant, but it works.


... and contravenes RFC 2822, as I read it:

In all cases, the "From:" field SHOULD NOT contain any mailbox that
does not belong to the author(s) of the message. See also section
3.6.3 for more information on forming the destination addresses for a
reply.

(1) However, it's only a SHOULD NOT, not a MUST NOT.

(2) I suppose one could get into deep philosophical arguments about the
concept of "belonging" for a non-existent mailbox. :-)

From: and Date: are now the only two required header lines in a message.
I think the idea is that From: should give some valid information about
the origin of the message.

-- 
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.