Some emails aren't sent as HTML

The first email from GP doesn't look terribly nice. I'll wait before looking at this though as it's difficult to test properly from my build.

This is a common enough requirement in test environments.

Maybe this can help?
https://serverfault.com/questions/94640/how-to-redirect-all-outgoing-email-from-postfix-to-a-single-address-for-testing
Or let me know if you need me to take a look.