Email Notification not sent when Distributed Build enabled

I am using Continuum 1.3.7 and Build Agent 1.3.7. When I am disabling the build agent, the email notifications are being sent when there is any change of state. When I enable distributed build, the build is completing successfully, but no email notification is being sent. The Notifier section under Project Information page is also not showing any of the configured email ids.

If I add any Project group notifier, the notification is being sent to that email id irrespective of the distributed build state.

The ciManagement section of the pom.xml file is like below;

<ciManagement>
<system>continuum</system>
<url>http://server.url/continuum</url>
<notifiers>
<notifier>
<type>mail</type>
<sendOnError>true</sendOnError>
<sendOnFailure>true</sendOnFailure>
<sendOnSuccess>true</sendOnSuccess>
<sendOnWarning>true</sendOnWarning>
<configuration>
<address>email.id@server.com</address>
</configuration>
</notifier>
</notifiers>
</ciManagement>

Please let me know if this is bug or not. If not, what I need to do to send email notification when distributed build is enabled.

P.S.: I have tested this with continuum 1.3.4 and 1.4.0 and both in Windows and Linux environment with no luck.

Thanks,
Bodhayan.