[Dovecot] deleteing label (cheating crackers)

Dear all, When i telnet to my server, I see following things: [root@daka ~]# telnet 0 110 Trying 0.0.0.0... Connected to 0. Escape character is '^]'. +OK Dovecot ready.

Now i want to delete Dovecot word & put my word. How i do?

Yours, Mohsen