woocommerce Order email confirmation not working?

Hi,
After placing the order with cheque option all the emails are working (order confirmation , tracking etc) but at the same time when you place the order with payment gateway like credit card or internet banking emails are not working any more .
I search on forum i found solution that works for other like install wp-smtp plugin try to send out the emails but again same result found not working .
https://www.ads-software.com/support/topic/woocommerce-new-order-emails-not-sending-1/
so can you help me out to fix this issue asap .