A return address may refer to any of the following:
1. In computer programming, the return address is the location directly after where a subroutine is called. When a return statement is called in a subroutine or the subroutine completes the program goes to the return address and continues running the program.
2. When referring to e-mail and mail, the return address is the address a mail returns if it is not successfully delivered. When sending an e-mail, the return address is your e-mail address or the address entered into the from section of the e-mail.