Setup SMTP relay / smarthost with Plesk with Postfix

Introduction

If you want or need to setup your mailserver to send all outgoing mail to a specific server which will handle the delivery to the recipients you need to setup a SMTP relay or smarthost.

Prerequisites

  • You need to know the hostname of the SMTP server which is going to relay the mail for your mailserver, which is smtprelay.snel.com in our case
  • This article assumes that no authentication is necessary on the SMTP relay server
  • This article is written for Plesk with Postfix
  • You need to have the SSH login details of your server ready

Step 1) Login with SSH
Login as root. Please see this article for instructions if you don't know how to connect.

Step 2) Configure the MTA
Open the configuration file of postfix with your favourite text-editor:

nano /etc/postfix/main.cf

Find the following lines:

relayhost = 

Change to:

relayhost = [relay.mailchannels.net]:587

Save and exit with CTRL+X.

Step 3) Restart the mailserver
Restart the mailserver by issuing the following command:

service postfix restart
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