We have created a new group with name as " Mail group " and did the following settings.
Plese help me out in this.
did you tried this?
To diagnose why a user is or is not receiving notifications for an issue:
check this doc for more information
https://confluence.atlassian.com/display/JIRA/Configuring+Email+Notifications#ConfiguringEmailNotifications-Troubleshootingemailnotifications
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