Hi.
Is it possible to prevent users add certain TLD to their account ?
Example: *.tk *.ga etc...
Those TLD are free and can be registered anonymously, and sometimes used for spam.
I believe that's possible. You can use the "Prohibited Domain Names" from the Tools & Settings page under the Security header. Just add a domain with a wildcard. For example *.tk to prohibited the usage of a .TK tld.