Hi there, here is the reply of the service provider...don't know what to do!
Thank you for contacting Technical Support. I'll be happy to assist you.
If you are going to use WordPress' DNS servers, you would need to contact them directly for assistance with the MX records and email routing for the domain, as the host record and MX records cannot be altered or troubleshot from the access.enom.com panel when using custom nameservers. Likewise, when you use custom DNS servers, the domain is not being pointed by our nameservers, so we could not troubleshoot any issues you may run in to.
Again, if you want to continue to use custom nameservers, you will need to contact that provider directly for assistance. Alternatively, you can place the domain back to our nameservers, and contact the provide for alternate methods for pointing the domain using host records only."
What you think about this?