521 error getting

Hi ,

I am getting this mail repeatedly from cloud flare

When I was checked it was my email service
I am using mail gun ,when I was checked with mail gun they are telling we have not blocked any ip’s of cloud flare.

Any one pls suggest any solution for this.

Below is the message I received

Error 521 occurs when the origin web server refuses connections from Cloudflare. Security solutions at your origin may block legitimate connections from certain Cloudflare IP addresses.

The two most common causes of 521 errors are:

· Offlined origin web server application

· Blocked Cloudflare requests

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