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Typing the end-of-file character (C-D) on a line alone finishes compose mode and sends the message to its destination. The C-D character looses its special meaning if ignoreeof mail variable is set.
If mail variable dot is set, typing dot (.) on a line alone achieves the same effect as C-D above.
Finally, using ~. escape always quits compose mode and sends out the composed message.
To abort composing of a message without sending it, type interrupt character (by default, C-C) twice. This behavior is disabled when mail variable ignore is set. In this case, you can use ~x escape to achieve the same effect.