SMTP port 25 is not listening on a Plesk for Windows server with MailEnable: Could not open connection to the host, on port 25: Connect failed

Symptoms

• SMTP port 25 is closed (not listening) on a Windows Server with MailEnable mail server. It is not possible to telnet to this port:

  C:> telnet localhost 25
  Connecting To localhost…Could not open connection to the host, on port 25: Connect faile

• Emails are not delivered from external mail services (Gmail, Outlook) to a Plesk mail server without any errors in MailEnable logfiles.

Cause

Custom SMTP port is specified in SMTP settings of MailEnable Management console.

Resolution

1. Connect to a Plesk server via RDP.

2. Start MailEnable Management console at Windows Start > All Programs > MailEnable.

3. In MailEnable Management console, expand Servers > localhost > Services and Connectors > right-click on SMTP and open its Properties.

4. In SMTP properties window, switch to the Inbound tab > click Settings in the Port Settings section > set the setting SMTP service listens on port to 25. Apply the changes on both windows.

   

5. In MailEnable Management console, expand System > Services Status > click on MailEnable SMTP Connector > Restart on the right pane.