Heroku is blocking my MX records at my domain provider.

Heroku is blocking my MX records at my domain provider.

Hi Zoho team.
I configured my domain properly with my DNS provider, everything was working perfectly.
After adding my heroku APP CNAME, everything stoped working, I can still verify my domain, but I'm not abel to verify MX,SPF or DKIM records.

This is the record for the app at heroku:
CNAME
mydomain.com
mydomain.com.herokudns.com
0 900