This tutorial will be showing you how to set up multiple mail domains (virtual hosting) with PostfixAdmin, which is an open-source web-based interface to configure and manage a Postfix based email server for many domains and users.
Prerequisites
To follow this tutorial, it’s assumed that you have already configured PostfixAdmin with one mail domain and you have followed part 4 to set up SPF and OpenDKIM.
What You Need to Do
If you want to host multiple mail domains, then you need to
- Add a new mail domain and user in PostfixAdmin web-based panel.
- Create MX, A and SPF record for the new mail domain.
- Set up DKIM signing for the new domain.
- Create DMARC Record for the new domain.
- Set up RoundCube Webmail, Postfix and Dovecot for multiple domains
Read full tutorial here: https://www.linuxbabe.com/mail-server/host-multiple-mail-domains-in-postfixadmin
