I got outlook 365 for business for myself. I've created "Catch All" rule for any email to my domain to my personal email.

I want to be able to reply from original email address as if it existed in domain. How to set it up?


I registered to RandomStore using randomstore@mydomain.com email and read it when I login to personal@mydomain.com

How to reply to their emails from randomstore@mydomain.com? If I try to do it now I get "You don't have permission to send messages from this mailbox." error. This email does not exits in domain so I cannot set "SendAs" for this email.


Exchange Online? Based on my knowledge, it is not feasible. This should cause security issue.

  • It would help if you explained why it's not feasible (hint: The SendAs permission applies to mailboxes, not email addresses). – I say Reinstate Monica Oct 14 '19 at 19:24

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