How to Set up iRedMail Multiple Domains with Nginx

This tutorial will be showing you how to set up multiple email domains with iRedMail, which is an easy way to set up your own email server.
Prerequisites
To follow this tutorial, it’s assumed that

You have already set up a iRedMail server with one domain.
You are using the latest version...

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How to Set up iRedMail Multiple Domains with Nginx