Connection to Microsoft Exchange is unavailable error - Exchange
https://learn.microsoft.com/en-us/exchange/troubleshoot/outlook-issues/connection-to-microsoft-exchange-is-unavailable-error?source=recommendations
WEBJan 24, 2024 · Sign in to the Exchange admin center. Select recipients, select mailboxes, and then double-click the user's mailbox. Select email address, select Add ( ), select SMTP, and then add a new alias that uses the .onmicrosoft.com domain. For example, add the [email protected] alias.
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