@Jain I created a post addressed to you. and we'll see if it's delivered to your server.
for a while I get HTTP error 400 when I try to deliver posts to my subscriber on your server.
my server periodically tries to re-send the undelivered posts. so I guess there're should be a plenty of records with errors on your side.
I'm busy now and will get back in 5-6 hours later to see if the post was delivered. you can check your logs there for error 400.