This is a complete overhaul of the restrict registration plugin, featuring:
- Whitelist - limits registration to email addresses with specified domains
- Blacklist - stops registration of email addresses with specified domains, perfect for dealing with repeat bozos from a known domain name
- Wildcard domains - specify wildcards in lists, e.g. *.com, *.example.org
- Whitelist vs. blacklist resolution - logically deals with conflicts between whitelist and blacklist when wildcards are used (see configuration section in readme)
- Admin page - edit the lists in the bbPress admin area
- Show whitelist option - optionally show the whitelist domains on the registration form