[exim] SPAM testing

Hello everyone,

I've built an exim dev environment for pre-production testing. Once my
supervisor is sufficiently impressed with the dev environment, we will be
rolling exim into a production setting. So far he's been quite impressed
with it.

The only thing he'd really like to test thoroughly is the anti-spam
capabilities. What I'm wondering is: are there services out there to test
against spam, or would setting up a dummy email address and registering
for online prescription/etc be the "best" method to test spam rejection?

Thank you for your comments/opinions