Thankyou rahul for your reply,
you have replied
We have fired an event called checkout.order.save.after after successful order save and listening it to admin using below line -
Event::listen('checkout.order.save.after', 'Webkul\Admin\Listeners\[email protected]');
and calling a function sendNewOrderMail and sending mail.
Here i wanted to ask how are you calling above mentioned function because i have already included that event