Set up SMTP relay / smarthost with 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 which 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
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