Sending, receiving, and organizing email in Outlook.com
For details,you can follow these documents:
- Remove your email account in Mail.
- Add your email account in Mail again. When adding the account, make sure that you choose the correct email service provider for your email address.
I've done this several times, it still doesn't work (it works for a few hours and then the problem comes back).
In the link you provide, it says: "When you add an email account to Mail on your Mac, choose Microsoft Exchange for email accounts that end with onmicrosoft.com and for accounts that end with outlook.com, hotmail.com, or live.com."
I've already done this as I said in my first post: even choosing Microsoft Exchange doesn't work (it works for a few hours and then the problem comes back).
Thanks.