Mail Hosting Help

My domain email is hosted by Zoho Business and I just transferred registrars of my domain from 1and1 to godaddy.

Do I need to reactivate domain settings in Zoho or will email continue to work?

I went into the godaddy settings for MX records and it asks for:

1 - Host Name
2 - Goes to Address
3 - priority
4 - TTL

from reading the wiki and help sections I didn't know what to put in Host name and put mx/mx2.zohomail.com in the "goes to address" fields. I also set TTL to one hour, is this correct?

What is the Host Name setting?

Thanks,

James