Set up SMTP relay on Plesk with Postfix

Estimated reading time: 1 min


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 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 = []: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.

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