Domain on Cloudflare for different subdomains / Mail and Hosting on Netcup ?

    I plan to move my domain to Cloudflare and copy all current DNS records (including mail) there?

    Domain Control Cloudflare
    Mail Netcup Records on Cloudflare
    Hosting Netcup Records for @ on Cloudflare

    1. Will domain and mail continue to work correctly in this setup?

    2. What happens if Netcup later changes mailserver hostnames or MX/TXT records – is there a way to get data automatically (API or similar) or do I need to adjust manually?
    3. How can I check the actual records (MX, SPF, DKIM, DMARC etc.) that are currently in use (Fetch, Manual ) ?