E-mails account for the domains of my multisite

Hi,

I hope you are well today :slight_smile:

I have a multisite install and I use domain mapping to allow a custom domain for each subsite.

However, I do not know how to create e-mails for each domain. I've read about the google company email service, but it is very expensive. I think it is what the wix.com adopts (Am I correct?).

Please, any suggetion about how to solve my problem?

Thanks a lot.