mutt/postfix return-path

[Bob Nielsen]

On Wed, Feb 16, 2005 at 06:16:24AM +0000, Jonathan Lim wrote:
> Thanks Bob. I have a folder-hook setup to switch my profile already.
> However, it does not matter what I set my From: address to, the
> return-path is still set to my username at mydomain.

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.

RFC 822 says:

 This field is added by the final transport system that delivers the message
to its recipient. The field is intended to contain definitive information
about the address and route back to the message's originator.

That indicates to me that it is added somewhere along the route to the 
destination, so I don't know what you can do about it.  I thought that 
mailman looks at the From: header to determine if a sender is a member 
of a list (although this can easily be spoofed, of course).