Error while creating an email – “That account name is not allowed for use with this service.”

Hello I want to create a new email account on my domain thrust.in. The name of the account is akshit. I believe it is not letting me create the account because of the word '****' which is blocked by the system. But Akshit is an Indian name. Please resolve this matter ASAP! And one suggestion. Remove these blocks from your system please. It's our domains. We should be allowed to create the accounts with whatever names we want.