How to enable email relay in Plesk for a VPS

Overview

The following support article demonstrates how to enable email email through a Virtual Private Server (VPS).

Instructions

1. Once logged into Plesk, from the “Server Management” tab on the left, click on “Tools & Settings”.
   
2. Under “Mail” click on “Mail Server Settings”.
   
3. Under “Relay options” select “Authorization is required:” and then select from the two options for authentication based on your requirements. 
   
4. Click “OK”.

This will allow email relay for all customers of your VPS.