How to change the hostname and SMTP banner in Postfix on a Plesk server

Question

• How to change the hostname in Postfix on a Plesk server?

• How to change the SMTP banner in Postfix on a Plesk server?

Answer

1. Connect to a Plesk server via SSH.

2. For security reasons, create a backup file of the Postfix configuration file main.cf:

   # cp /etc/postfix/main.cf /etc/postfix/main.cf.bak

3. Open the main.cf file in a text editor. In this example, we are using the vi editor:

   # vi /etc/postfix/main.cf

4. Add/modify the Postfix configuration parameters myhostname and smtpd_banner the following way:

   myhostname = server.example.com
   smtpd_banner = $myhostname ESMTP $mail_name

   Note: Make sure that other myhostname and smtpd_banner parameters are disabled (contain # at the beginning of the line).

5. Save the changes and close the file.

6. Check Postfix configuration syntax:

   # postfix check
   (empty output - means syntax is OK)

7. Restart Postfix:

   # service postfix restart