I have an outlook.com account with a custom domain name (mydomain.com) and three email accounts that all use the custom domain name.

I created an alias (*** Email address is removed for privacy ***) on one of the email accounts (*** Email address is removed for privacy ***) that use the custom domain.

Any email sent to the main account (*** Email address is removed for privacy ***) is delivered no problem but email sent to the alias (*** Email address is removed for privacy ***) bounces with the error message: 550 Requested action not taken: mailbox unavailable

I have read in some posts (older ones) that Microsoft Outlook.com does not yet support alias that use a custom domain name, nly alias that use *** Email address is removed for privacy ***, *** Email address is removed for privacy *** etc.

Can you confirm or deny this is the case?

Thanks

David