After configuring a notification policy via TSIM Admin console, email notifications are not received even though the exit code is 0 in MC_ACTION_RESULT slot. Even in the MC_OPERATIONS slot the list of email recipients can be seen:
One more thing, we are able to received MFD reports generated by TrueSight and along with test emails generated with email.sh or pw test_email command and problem is only with Notification policy.

Verifying the following will help in identifying the root cause and fix the issue:

1. Check if the notification service is not empty. If it is then add Notification service
2. Check if Notification source  is set correctly in the Notification policy
3. Check if the SMTP server details have been configured correctly in the Operating System configuration. This can be confirmed by manually sending test emails with the below commands:
   • Windows:
     • Navigate to %MCELL_HOME%\bin directory and run the following command:
       • smail.exe "email" -t " <recipient’s email_address> "  -s " test smail " -body "This is Email body"  (Note: Make sure leading and trailing space is given for email address in -t flag)
   • Linux:
     • mail -s "Test Subject" <recipient’s email_address> < /dev/null
4. Verify with SMTP server management team if there any emails stuck on the SMTP server side
5. If no email is received with the above command, then its possible that SMTP server details are not stored in Operating System and it should be registered manually with below procedure:
   • Windows (use any one of below methods):
     • Navigate to %MCELL_HOME%\bin directory and execute below command:
       • smail -install <server address> <sender's address>
     • OR
     • Via User Remote action "Setup Sending SMTP E-mails - Windows Only" in TSIM/ProactiveNet Operation console
   • Linux
     • It is recommended to take assistance from Linux Administrator as the procedure to register SMTP server depends on various factors