CNAME not working -recipient error

I am trying to setup a CNAME because DNS is not possible.
However; this error is reported by the recipient sever (host smtp.sparkpostmail.com) unwilling to deliver to the final recipient.
How can this be solved?

I am afraid you cannot use a proxied hostname (:orange: cloud) for your e-mail.

To make your e-mail service work propperly, kindly click on the :orange: button in a row where A mail to make it :grey: (DNS only).

Since mail traffic cannot be proxied through Cloudflare by default, you will expose your origin web server’s IP addres …

Cloudflare’s default configuration only allows proxying of HTTP traffic and will break mail traffic.

Otherwise, if your A mail record is not :grey:, your e-mail will not be delivered or work as it should be working due to the below articles which provide more detailed information and a workaround solution how to make sure your e-mail keeps working while using Cloudflare for your domain:

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