No emails after changing nameserver



I am absolutely new to this.
I have my domain with another provider and would like to keep it that way. My website shall be hosted with DH.
So I changed the nameservers at the domain host to DH.
Since then I can’t receive emails anymore, they bounce back.
But I still can send emails and they arrive.

What do I have to do???

Thanks for your help.


I think I resolved my problem.
I deleted the email addresses at my domain provider and set up new ones at DH.
It works.