On the Authentication pop-up menu, select the authentication type, and then enter your credentials as necessary.Ĭause: Your ISP or network has a firewall that blocks connections to your email service's outgoing mail (SMTP) server. Under Outgoing server, select More Options… In the left pane of the Accounts dialog box, select the account. If you verify that all your account settings are correct, but you still can't send messages, try turning on SMTP authentication. Some email services, including iCloud mail accounts, 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. 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. If you are on a local network, see whether you can access intranet sites. Use a Web browser to see whether you can access Internet sites. Solution: Make sure that your computer is connected to the Internet or your network. Cause: Outlook doesn't have a connection to the Internet or your network. Note: Are you using Outlook for Windows? Visit I can't send or receive messages in Outlook for help.
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