I Installed Ngnix on my Ubuntu 18.04 Server. Configured Virtual host .80 to 8080. Now I'm getting 502 Bad Gateway.
Any solution for this?

@vipin Thank you so much for your Help.

And this is the warning I'm getting.

Here you can see that Everything is as according as you mentioned

Here is teh Mailbox Configuration. and it's status is enabled.

Here is the response I got.

Still we are getting the same issue... even for Gmail as well.
Is there anyone who can guide us to solve this issue?
Ubuntu 18.04.
1.0.14 Version we are Using.

I used correct details, but the same error I'm getting yet.