On Wed, 15 Jun 2005 [EMAIL PROTECTED] wrote:

> What does sender_domain check? The envelope or the from: field?

Envelope. In theory, an MTA is concerned only with envelopes, just like 
regular snail mail post handlers. (In practice these days, MTAs often 
have to look inside to do various checks.)

> What is the relationship between the from: field and the envelope? What
> info gets filled in from where?

There is no relation. The creator of the message can fill in whatever 
they want to, though a Message Submission Agent (MSA) may enforce 
certain constraints.

> Pointers to the Exim spec will do, but I was unable to find this info myself.

http://www.exim.org/exim-html-4.50/doc/html/spec_43.html#SECT43.11

gives some information.

-- 
Philip Hazel            University of Cambridge Computing Service,
[EMAIL PROTECTED]      Cambridge, England. Phone: +44 1223 334714.
Get the Exim 4 book:    http://www.uit.co.uk/exim-book

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