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Subject: Re: Who sets Sender:?
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>>>>> Norman Walsh <ndw@nwalsh.com>:

> Ok, fair enough. So this presents an interesting conundrum. In my
> case, the "local machine" has no name. I'm on a laptop behind a
> firewall attached to a cable provider that generates a "random" IP
> address via DHCP.

Been there.

> So, on my local subnet (192.168.1.*), "mercury" is this laptop. But
> there's no global name for it.

Been there too, when my laptop was at home.

> I can't claim that it's 'mercury.nwalsh.com' because no such machine
> exists in DNS.

What I do is to make sure Gnus doesn't create a Sender: header by
having
	;; Avoid setting the sender header, and by this use the From: address
	;; as the envelope address
	(add-to-list 'message-syntax-checks '(sender . disabled))
in my ~/.gnus.el.

Then I make sure exim sets the From line of the envelope to be the same
as the From: field, by setting the return_path of outgoing SMTP
messages in /etc/exim/exim.conf:
	remote_smtp:
	  driver = smtp
	  return_path = ${local_part:$reply_address}@${domain:$reply_address}

(this is on debian testing).