Disclosed are a mobile terminal and controlling method thereof, including wireless communication unit configured to transceive mails, touchscreen configured to display at least one first mail previously received through the wireless communication unit, and controller, when a command for a reply or forwarding of the displayed first mail is inputted, displaying a composing window of a second mail including the first mail, the controller, when at least one mail address information included in at least one original text in the first mail is selected from the composing window, automatically setting a mail address matching the selected mail address information as a recipient or carbon copy mail address of the second mail. Accordingly, when a mail address of a recipient or carbon copy of a replied or forwarded mail for a received mail, the mail address can be conveniently set using mail address information included in the received mail.