- Plesk for Windows
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 failed
When running the following command in a command prompt, there is no line "<IPv4>:25 Listening" in the output:
C:\> netstat -aon | findstr 25
Emails are not delivered from external mail services (Gmail, Outlook) to a Plesk mail server without any errors in MailEnable logfiles.
It is not possible to login via mail client or mobile device via IMAP protocol, when port 143 (default IMAP port) is set as SMTP service port in SMTP properties of MailEnable.
Custom SMTP port is specified in SMTP settings of MailEnable Management console.
Connect to a Plesk server via RDP.
Launch MailEnable Management console at Windows Start > All Programs > MailEnable.
In MailEnable Management console, expand Servers > localhost > Services and Connectors > right-click on SMTP and open its Properties.
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.
In MailEnable Management console, expand System > Services Status > click on MailEnable SMTP Connector > Restart on the right pane.