Hi @ML8589 sorry for the issues you’re facing. I see your ticket with Support and it will take some time for the team to reply to you. Note that the domain you indicated is not using Cloudflare. You can verify this by using https://www.whatsmydns.net/. You can use this site to search for past dns record history, https://securitytrails.com/.
Thank you, I don’t see any blocks or bounces on the account you indicated. Can you have them/the account owner reply on the ticket to Support from their email? And, please ensure the following addresses are on the allowlist at your origin mail server: [email protected] and [email protected].