At this time, your domain is not using Cloudflare.
Should you return to Cloudflare, in your DNS records here, you need a DNS “A” record for mail.theceltos.com, and make sure it’s set to 
DNS Only. If you’re not sure what the value of that DNS record should be, please reach out to your mail host to get that information. Judging from your current setup, that IP address would be the same as theceltos.com.
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