shivanand prabhu tendulker wrote:
> 
> Hi Emmerich
> 
> Thanks a lot for your help.
> 
> I too had similar thing in my mind  but I don't know
> how to write the envelope header to message header .
> 
> Will it require writing of new rule-set in sendmail
> configuration file?
> 
> Please help me out.

Well, here starts the more complicated part. For our solution, we
have written a custom mail delivery agent (MDA), which is used by
sendmail. In sendmail.cf we configured it like that:

Mlocal (more definitions)  P=/opt/mailrelay/psender A=$h $f $u

This means, the local delivery (on the ISPs email-server) is done
by psender. psender gets the envelopes from ($f) und the envelopes
recipient ($u). psender adds two lines to the header:

from__ $f
for__  $u

I can see, that here you probably can't use an identical approach
- to much change and fiddle on your ISPs side :-(  

We did it on a dedicated server and I forgot, that we also changed
the MDA, sorry.

Bye

Emmerich



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     Emmerich Eggler                          [EMAIL PROTECTED]     
     Eggler Communications              +41 (0)79 438 75 11   
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