Soverign provides a good basis for an email server setup. It describes itself as a "set of Ansible playbooks to build and maintain your own private cloud: email

Soverign provides a good basis for an email server setup. It describes itself as a "set of Ansible playbooks to build and maintain your own private cloud: email, calendar, contacts, file sync, IRC bouncer, VPN, and more." https://github.com/al3x/sovereign https://github.com/al3x/sovereign