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

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

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.

Is Microsoft Outlook down right now? Are Hotmail email servers down today? What does Down Detector say? 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.

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.