I can assure you, Jack, that no block has been applied to your name or email address, so it’s not obvious why you’re having difficulty posting with those details. It’s seemingly a problem with the Cloudflare web service, which acts as an intermediary to defend the blog against hackers and other malicious or unwanted traffic.
My last attempt at posting this message also disappeared into the ether, so I’ve had to retype it. It is quite a disruptive flaw. I reckon our system administrator needs to adjust the Cloudflare parameters to a more liberal setting.