The email address that I used for this forum was a juno.com email address. I changed it to an email address from a service that should never be sending out spam. I don't think it has anything to do with the users' email addresses. The main thing I have seen causing this issue is if you use a blacklist service to "help prevent spam". Those services never work. If one email address from a domain is found to be sending spam, the entire domain is blacklisted. Of course, ALL domains have at least one email address that is sending spam, usually due to a user's infected computer.