Facing notification issues

I want my email notification to ring like an alarm until I read them or do any action

Do you mean that you get notification, but this should not be a simple sound/vibration but a long lasting alarm sound?
Or do you not get any notification at all?

If you get notification you should already be able to set any kind of sound for that - even a long lasting alarm. And maybe depending an the Android version a repeat counter. Would that help?