DNS settings

I just started with ZOHO-mail. My domainname has about 50 e-mail users. Just a few of them I want to use ZOHO-mail to check how this is working.
So I have MX-records in my DNS pointing to smtp1.myprovider prio 10 and smtp2.myprovider prio20
These MX-records I do need.
Is it possible to make extra MX records: mx.zohomail.com prio10 ?

Or is this impossible?