>I used an email provider that let me relay my mail from an arbitrary
>source once I had downloaded my POP3 email.
>
>Now I'm using Exim and Cyrus, and I'm wondering if I can do a similar
>trick?
I've written an exim patch that makes pop-before-relay really
easy. Grab it at
www.gwdg.de/~tcurdt/exim/exim-pop-before-relay.tgz
After appling this patch you'll have a new lookup which checks for
spool/auth files created by a perl script that watches the cyrus
output. Then all you need to do is running that perl script and
set exim up like this:
host_accept_relay = ipdir;/var/spool/popauth
cheers
--
Torsten