I set up outlook to Sugar, somehow I can only see inbox, but everytime that I try to sent email out it will show this...

“The system is unable to send the message using the outbound email account selected in the From field. Please check the settings for the account in the Mail Accounts tab in the Settings page, or select another account to use to send the message. Click OK to return to the message.”

Please kindly suggest me, what exactly in "Mail Accounts" tab that I should do.

Sugar Version: Professional Version 5.2.0j (Build 5804)
Email: Outlook, POP3