I have users telling me that they are not able to register on our site from their work address. They can register from their personal address. The email confirmation message doesn't seem to be in their local or corporate spam filter, so they suspect that our server is for some reason failing to send emails to their corporate domain.
What's the best way to track down this type of problem? Do I need to enable debug logging in order to verify that the registration requests are properly triggering the email verification step?