You get what you pay for. If they don't charge you money for a mailbox they are determined to make a profit from you some other way.

The company that provides your broadband connection may also give you one or more mailboxes.

Or you can go to one of the many companies that will provide your own domain and some email addresses in that domain. You can have your own website as well if you want one, but you can ignore that and just use the mailboxes if that's all you need.