mutt/postfix return-path

[Ewan Mac Mahon]

On Wed, Feb 16, 2005 at 07:32:51AM +0000, Jonathan Lim wrote:
> On Tue, Feb 15, 2005 at 11:12:17PM -0800, Bob Nielsen wrote:
> > I looked at all the headers on your message but don't see anything 
> > containing "return-path".  I only see this on a very few messages.
> > I don't see any reference to this in the documentation for either mutt 
> > or mailman either.
> 
> Actually this ubuntu list seems to be happier about me using mutt. When
> I tried posting to the SUSE list it barfed at me because my return-path
> differed from the subscribed address.
> 
> I ran a quick test. My local postfix relays to my mailhost.
So sending from mutt goes like this: 
mutt->local postfix->mailhost->destination?

Does evolution send via the local postfix too, or does it do smtp
straight to the mailhost?


> I have been trying to understand what is setting the return-path. If the
> MUA is not setting the return-path, then why do Evolution and mutt
> produce different return-paths?
> 
The 'MUAs don't set return paths' thing may be a little misleading;
traditionally they don't, but traditionally MUAs require an MTA with a
sendmail command line interface (which postfix has, and mutt uses).
However modern MUAs (like evo and thunderbird) often do the job of the
local MTA themselves by sending to a mailhost over SMTP. If they do that
they will be able to set the return-path header. Mutt doesn't blur the
MUA/MTA distinction like this, and therefore will not have any influence
on the return-path; if you're going to make this work you'll need to
have your local postfix rewrite your 'internal' address to you external
one.

Ewan 
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