Columba will normally send mail as soon as you click the button. However, there are a few ways you can save a message to be sent later:
If you are offline, Columba will add your messages to the Outbox queue. The next time you are online and send or receive mail, that message will be sent when you select or click the ->F10 function key. It will not be sent as part of a normal selection or by pressing the ->F9 function key.
Choose to store your messages in the draft folder ->