In my previous iMac which was 8 years old, I had it set up to be able to automatically connect to my usual @outlook.com account whenever I clicked on the mail icon to forward a webpage to someone.
The way it was set-up, it would only be able to do this function and would not receive all my incoming @outlook.com emails. I have followed your instructions and the new Mac is now the same.
But now I want to know if I could delete all the mail that was downloaded into Mail before I disabled the incoming feature.
I hope you are able to follow all that I've typed here. If you understand what I'm trying to do, please instruct me what steps to take to delete all those downloaded email from Mail. Also, advise me if this is not a good action to take. I just feel that it is sufficient to have my emails in the @outlook.com inbox rather than have a copy of the incoming mails in Mail, too.