I have finished setting everything up on a test system using a
different flavor of Linux and a more current version of everything
than my production system. Let's call them prod.example.com and
test.example.com. Without interrupting mail service on prod, which is
half of what that system does so I really can't take it down and wait
for DNS changeovers back and forth, what can be done on test to make
it look like and work like prod? For instance, when I start Postfix on
test, it's trying to deliver messages to prod and is unable to. I
could extract stuff from maillog which might be of some help to figure
out what's going on, but before I do that, is it even possible to do
what I'm wanting to do--spoof my current Dovecot+Postfix setup to
think it's on prod when it really isn't? By the way, it's OK for
messages from test to get into prod, people on the mailing lists on
prod know this could and probably will happen.
