Using Classic Outlook on Windows for personal email, calendar, and contact management
I am here volunteering my time without getting paid. I know the problem and solution because I'm a mail admin. What I don't appreciate is being called rude when I offer my free help. That's all. I won't hold back and/or apologize like many helpers here. I will talk back if I don't like something. You may report my reply if you don't like it. I don't really care if I get banned permanently.
This problem requires someone who understand a bit of how email system works. It's ok if you don't understand it but you can't expect Microsoft (if they are your email host) to fix it... not because they don't want to help. It's because they can not help you even if they want to. Your option is either spend some time trying to understand the problem and solution or hire a professional IT. It's really not that difficult. I've helped many other users who have zero knowledge about this issue. They managed to fix the problem with the free guidance.
You have a nice day and year too.