[CentOS] email Server for CentOS 7

Sat Sep 29 20:51:07 UTC 2018
Bee.Lists <bee.lists at gmail.com>

Hi folks.

I’m looking for an email server.  I have a C7 box already with nginx, PostgreSQL, Sinatra and Ruby.  So I don’t want to install PHP, Apache, MySQL, etc.

Are there any ways/tutorials to set up a mail server under those restrictions?  It would serve multiple domains. 

Cheers, Bee