I will consider the email contact method in the future.
Your support agent has requested the full e-mail headers of the rejected message. I suspect that this triggered the cloudflare block. If I had known that this was the cause, I would add it as a PDF or TXT attachment.
From my point of view, important outgoing emails were rejected while my answers to the ticket system support were blocked. Not to mention that I did not receive an answer in your own forum. The support e-mail address is not very visible on the ticketing site.