If you want or need to set up your mail server to send all outgoing mail to a specific server that will handle the delivery to the recipients you need to set up an SMTP relay or smarthost.
- You need to know the hostname of the SMTP server which is going to relay the mail for your mail server, 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: Log in with SSH
Log in as root. Please see this article for instructions if you don’t know how to connect.
Step 2: Configure the MTA
Update the postfix configuration by issuing the following commands:
postconf -e 'relayhost = [smtprelay.snel.com]:587' postconf -e 'smtp_tls_security_level = may'
Step 3: Restart the mail server
Restart the mail server by issuing the following command:
service postfix restart
Congratulations, you have now installed SMTP relay / smarthost for your mail server.