I get occasional notifications from senders such as banks that I’m unreachable via email and I should update my email address. Or that they can’t send me e-statements and will switch me to paper statements 
I’ve also seen cases where I did not receive order confirmation emails when I bought things online.
My forwarding address is Gmail and it seems most emails make it, but apparently not all.
Does Cloudflare keep any logs of attempts that result in fatal errors? Or could it be the case that some senders do not like the Cloudflare MX settings for whatever reason?
If you can contact me through some secure channel I can provide more info which senders are having a hard time and help debug.
