Difficulty with Outlook 2003 (not sending)

Difficulty with Outlook 2003 (not sending)

I'm using imap with Outlook 2003, two iPads and two iPhones. The IOS systems are working fine and I am able to receive messages from Outlook 2003. However, outbound messages are not working. Outlook indicates that the message is being sent but it hangs and never completes the task. The status message that hangs says the task has completed but the message is sent immediately to the outbox and never departs. Thanks