Counterfeit mail senders always tell you via the in-game mail that your account has won a lucky draw with a reward of XXX TPs. What you need to do is to send a certain amount of in-game Golds to him. Once you've sent Golds to the character he told you, he will not appear to you any more.
Solution - Ignore these people!! Welcome to take the screenshots of related dialogue or mail content and send them to the official Support. GMs will check them seriously and ban all related scammer's accounts forever!!
A Mail from a Fake GM