How to specify the hostname used by MailEnable for sending outbound mail

Applicable to:

Connect to a Plesk server via RDP.
Start MailEnable management console at Windows Start > All Programs > MailEnable.
In MailEnable management console, expand Servers > localhost > Services and Connectors > right-click on SMTP to open its Properties.
In the opened window, specify the server hostname in the Default mail domain name field, then click OK.
Restart the SMTP service:

5.1. Right-click on SMTP > click Stop

5.2. Right-click on SMTP > click Start

For more information, see MailEnable KB article: