- Select File | Options | Advanced.
- Under the Send/Receive section, uncheck "Send immediately when connected". Messages will be held in the "Outbox" folder until you click Send/Receive (F9). The Send/Receive action has the affect of doing an immediate Receive after Sending messages that were held in the Outbox.
- If you want to "Send only" then you can select Send All from the Send/Receive pull-down menu.