Thus spake Vincent on Mon, Feb 27, 2006 at 07:05:40AM CST

You might also look into using ssmtp an intermediary in the smtp process, although this would be a per-client solution and would only work on Linux clients, so it may not be ideal for you. Local MUAs would then need to contain appropriate configs to rewrite the body From header based on the destination address.

On the other hand, ssmtp is a very simple smtp tool which works as a sendmail interface, so it's an outbound-only smtp client, and would work with any CLI tools which effectively invoke /usr/sbin/sendmail or equiv. It contains the following config option:

# Set this to never rewrite the "From:" line (unless not given) and to # use that address in the "from line" of the envelope. FromLineOverride=YES

ssmtp will then talk to whatever your outbound smpt server is, which should preserve the envelope from address.

I've not come across any facility in courier which can do this, but courier contains many corners which I haven't visited.

Of course, there's always something along the lines of a classic Unix hack which involves renaming /usr/sbin/sendmail to sendmail.real or something similar, and replacing /usr/sbin/sendmail with a perl or python (or awk/sed) script which will do the appropriate header rewriting and pass the mail on to ssmtp in some fashion. You wouldn't need to configure your individual MUAs in this case. My guess is that you don't want to go there ;-)