If you get the The server responded: 421 Cannot connect to SMTP server error when trying to send emails in Outlook, use these fixes.

Stop, you should wait to install Office You won’t be able to receive mail from a current mailbox. Outlook requires access to the Autodiscover service for your Exchange service.

If your business uses Microsoft Outlook with Outlook Web Access enabled, you can use your web browser to connect to the OWA server to send and receive email. If you're using Office 365, the cloud ...

My outlook 2010 clients will not connect to their respective mailbox servers when the outlook connection is manually set to connect to mail.domain.org - which is the 2013 CAS server.

Is Outlook down right now? Is Hotmail login down today? What does Down Detector say about Microsoft email server outage? What we know.

Is Outlook down right now? Is Hotmail login down today? What does Down Detector say about Microsoft email server outage? What we know.

Mac 911 How to fix a Microsoft Outlook login that won’t work due to local port conflicts on your Mac A not-very-obvious local web server may prevent proper Outlook authentication.