How do I whitelist MageMail for CloudFlare timeouts?

If you're using CloudFlare, and the API connection stops working, or is timing out, it may be due to CloudFlare's browser check:

You'll need to whitelist MageMail's server IPs, in CloudFlare, which are 192.241.220.17, 45.55.38.132.

Instructions for this can be found here: CloudFlare's website.