- Plesk for Windows
Unable to send emails from Plesk server and/or auto-replies do not work.
The following error messages can be found in Mail Enable Activity log under
C:\Program Files (x86)\Mail Enable\Logging\SMTP\folder:
SMTP Exception: The mail service is unavailable: 451 ESMTP MailEnaable Service temporarily refused connection from IP (127.0.0.1) because of policy violation.
MailEnable policy blocks the connection to send emails.
Connect to the server via RDP.
Start MailEnable Management console at Windows Start > All Programs > MailEnable.
In MailEnable Management console, expand Servers > right-click on localhost > Properties > Policies.
Disable the option Enable Abuse Detection and Prevention and press OK.
Alternatively not to disable the option completely, try whitelisting the trusted IP address at MailEnable Management > Servers > localhost > Services and Connectors > right-click on SMTP > Properties > Whitelist > Add.