Use Cloudflare DNS together with Dreamhost mailserver

Hi,
I use Cloudflare to manage my DNS records and have hosted my subdomain websites on my own homeserver.
I recently bought one mailbox at Dreamhost, because PTR records / rDNS is difficult to set up, and the DKIM, SFR, etc. looks difficult as well, so I’d like to link my domain to Dreamhost, while keeping my DNS at Cloudflare and my websites at my own homeserver.
I’ve only bought one mailserver, I didn’t buy a webserver or anything like that, so I can’t add cloudflare services in the edit tab of the domains.
Which DNS records should I add to Cloudflare to make the E-Mails work with Dreamhost?

With kind regards,