How to get sendmail to rewrite envelope recipient

[Nigel Wade]

Hi,

I am trying to get a trivial sendmail config. set up, but sendmail m4 just 
won't play ball.

This setup is for a simple client which should send all mail to our mail 
hub, qualify all names with our domain and rewrite hosts with the domain. 
E.g. a userid should be re-written as userid at domain, userid at host.domain 
should be re-written as userid at domain.

I've very nearly got it working, but I cannot get sendmail to use the 
correct envelope recipient when it's unqualified. It insists on using the 
FQDN of the mail hub even though I've specified the masquerade_envelope 
FEATURE (this doesn't appear to do anything).

Can anyone enlighten me as to what the magic incantation of sendmail mc 
define/features is to get it to do this?

I've tried MAIL_HUB and LOCAL_RELAY, which both seem to do the same. 
SMARTHOST won't relay unqualified addresses. The various masquerade options 
just don't seem to have any effect on what sendmail uses in its RCPT to:

This is the current sendmail.mc:

divert(-1)dnl
include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
VERSIONID(`setup for Red Hat Linux')dnl
OSTYPE(`linux')dnl
define(`LOCAL_RELAY',`mail.ion.le.ac.uk')
MASQUERADE_AS(`ion.le.ac.uk')dnl
EXPOSED_USER(`root')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
FEATURE(allmasquerade)dnl
MAILER(smtp)dnl

-- 
Nigel Wade, System Administrator, Space Plasma Physics Group,
             University of Leicester, Leicester, LE1 7RH, UK
E-mail :    nmw at ion.le.ac.uk
Phone :     +44 (0)116 2523548, Fax : +44 (0)116 2523555