Custom headers -- outgoing email

[Aaron Van Couwenberghe <vanco@sonic.net>]

Hi all

	I need to set some custom headers in my outgoing mail; however, it
appears the MUA doesn't have final say in this matter; the MTA does some
tinkering of its own in this field.
	I'm running mutt, and am using the exim MTA. Here are the relevant
headers from most of my mails:

From: Aaron Van Couwenberghe <vanco@sonic.net>
Sender:  <aaron@localhost>

I have mutt set up to include ~/.muttrc-local for each user. My
.muttrc-local has (among other things) the following commands:

set hdrs
my_hdr From: "Aaron Van Couwenberghe" <vanco@sonic.net>
my_hdr Sender: <vanco@sonic.net>

Now, where is the Sender: header being replaced? Does the MTA override this
setting? If so, how can one get a mail system useful for a single,
periodically connected account?

I ask this because some MDA's reject mails with inappropriate Sender
envelopes. IE my mails to certain private individuals bounce predictably.

-- 
..Aaron Van Couwenberghe... ..vanco@sonic.net.. ..aaronv@debian.org....
	Berlin:			http://www.berlin-consortium.org
	Debian GNU/Linux:	http://www.debian.org

"...Nothing astonishes men so much as common sense and plain dealing..."
	-- Ralph Waldo Emerson