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Some email services require authentication for their SMTP server. Solution: Turn on SMTP authentication for the POP or IMAP account. Cause: Some POP and IMAP email accounts use an outgoing mail (SMTP) server that requires authentication. Solution: Verify that Outlook is online. On the Outlook menu, make sure that Work Offline is not checked. For information about checking the status of your network connections, see Mac OS Help. On a local network, see if you can access intranet sites. Use a web browser to see if you can access web sites. Solution: Make sure that your computer is connected to the Internet or your network.
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Cause: Outlook doesn't have a connection to the Internet or your network. Message service can be interrupted for several reasons.
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