User Registration Prohibit email and website domains
 

Extremeley usefull would be a feature to prohibit certain domain names in any address, (email or website), at user registration time. This would mean I would be able to add endingings (e.g. mail.ru or gmail.com) to a table and the domain would be checked against this table. Should the user attempt to register using the aforementioned, the user would receive a message stating that the domain is not allowed. This error could also be optionalized at the same time. For example, An error a mail.ru user would not be notified, but a gmail.com user would.

Also good would be to check the contents of these domain names against the forbidden word store. This would mean that a domain with freeviagra.de (or .whatever) would automtically not be accepted without warning if viagra is in the forbidden list.