Since Version 2.2.0 of Discussion Board, you can block specific email addresses and domains from registering on your site. Anyone trying to register using a blacklisted email will find that their registration attempt fails silently.
To block emails, go to Discussion Board > Settings > User tab and enter an email address in the ‘Email blacklist’ field, e.g. [email protected] will cause this email address to fail registration.
If you want to block an entire domain, enter the domain preceded by the ‘@’ symbol: e.g. @spammer.com will cause all email addresses from the spammer.com domain to fail registration.
Enter one address per line.
