Preventing spammers: email addresses

One of the things I am doing to help fight spam is disallowing specific domains. Some are easy, and affect only the spammers. Others not so much.

At some point, I foresee having to block hotmail, yahoo and gmail accounts as eligible for signing up to be on this board. It is inevitable, as they are all used by spammers due to their free nature. IF you have an email at one of those providers and have another email address from your ISP, please proactively change it in your profile.

If one of those providers is the only way you can have access, I am working on a solution. :)