Unable to receive an email by task scheduler on audit failure in windows server 2008 r2 security log

Deal All,

I am sorry in advance if i would be on wrong forum, i have created a task on Server 2008 r2 Domain controller that when an audit failure event triggered in windows security log then an email should reach on my email ID, but unfortunately, nothing happen on audit failure.i receive no email from task scheduler.

kindly suggest me to resolve the issue. I have created Email task on  event ID 4771.

Thanks.

Zeeshan Ibrahim Network Administrator