Pine's postpone feature allows you to postpone your composition of a message, so that you can resume working on it at a later time. Pine confirms the postponement with:
[Composition postponed. Select Compose to resume.]
Pine will postpone a message for the duration of the current
session and even throughout subsequent Pine sessions. You may
postpone as many messages as you like. (Pine stores all the
messages you postpone in a folder called ``postponed-msgs.'')