* lisp/mail/rmail.el (rmail-start-mail): Record the frame from which an Rmail command, such as 'rmail-mail' or 'rmail-reply', was invoked. (rmail--find-orig-rmail-frame): New function. (rmail-mail-return): Use 'rmail--find-orig-rmail-frame' to find the original frame, and make it the top frame on its TTY terminal. (Bug#69738)