Hello! I was just looking though the blog post announcing mailchannels integration and saw this line:
The only constraint currently is that the integration only works when the request comes from a Cloudflare IP address. So it won’t work yet when you are developing on your local machine or running a test on your build server.
I was wondering if that meant that mailchannels just checks if the requester's ip is cloudflare's or there is more security behind it (e.g authorization header that cloudflare adds on)