Mails are in queue since 20 days

Hi

My site is healthhelp.in. I have installed plugin email subscriber.

New posts are shown in queue since 20 days but none of the mails are being delivered

Since then 2 more notifications are in queue.

I have also installed WP Mail SMTP. This has been successfully tested with test mail but still no success

Kindly GUIDE

Regards

Giant

The page I need help with: [log in to see the link]