Thank you for asking.
From what I do understand, you want to use Cloudflare SSL (Origin CA Certificate) for your e-mail related hostname like
Unfortunately, this will not work as far as Cloudflare Origin CA Certificate encrypts HTTPS traffic (only for web).
You would need a valid SSL certificate (like Let’s Encrypt) for your mail hostname like
mail.yourdomain.com from which you are going to receive/send e-mails.
Nevertheless, your e-mail related hostname(s) like
mail.yourdomain.com should be set to (DNS-only).
In case you are asking for Zimbra Webmail interface, I believe yes, you can use Cloudflare Origin CA certificate.
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