You can suspend the connection to your server to stop network traffic. When you do this, any items you create are stored in your Outbox until you reconnect.
To suspend the connection, choose Offline from the options menu.
To see the contents of your Outbox, choose Outbox from the options menu.
You can delete an item in your Outbox before you reconnect and it gets sent to the server. To do this, choose Cancel from the menu. To delete all items in your Outbox, choose Empty Outbox from the options menu.
To reconnect to your server, choose Online from the options menu. This will empty your Outbox as the items are sent.