Setting up free professional email?

[Michael C.]

This may be slightly out there, but I am trying to set up a customer email for my new business.  I already have a domain name registered, and was looking to see if there were free email applications.  Looks like gmail and the like have all moved to a pay service.  What does everyone use for setting up their business email?  Do I have to resolve for paying someone for the service?  I'm not looking to just have a yahoo.com address or something like that.  I want to leverage my personal domain.

Appreciate any feedback!