In other words, only you control your emails, and third-parties have no access to them unless you purposefully - or accidentally - allow it.
While email clients may require a little more work to run, they also allow for more control over user data. There are many different office software suites but Google Workspace formerly known as G Suite remains the original cloud one and one of the best business office suites, offering a huge range of features and functionality that rivals can't match.
Google Workspace : Collaboration + productivity apps