How to delete email from the server? I am using Outlook version 16.16.2 (180910) as a communication program for my company's email address.

When I delete messages from my Inbox, the action done locally on my Mac, but I need it to be deleted from the company's server too.

How can I do that?
If you are setup for POP (which it appears you are) then check this out...

That preference would be in Outlook menu >  Preferences > Accounts > your POP account > Advanced > Server tab.
Uncheck the option “Leave a copy of each message on server”.