First go to the Send/Receive tab and click Send/Receive Groups
Next, click on Define Send/Receive Groups
When the window opens, click Edit
If your account listed has a Red X by it, check the box to include the selected account in this group.
Finally click OK, and then click close of the previously opened box. Also uncheck the Schedule an automatic send/receive every option.
Now, try sending yourself a test message, and you should receive it within 1 minute.