tinydns configuration

My brother has setup my domain on his dedicated servers. He says he uses tinydns as name servers and asks me to give the IPs of the SMTP mail servers because tinydns only accepts IPs. You have told me to add mx.zoho.com and mx2.zoho.com as mx addresses. Tinydns cannot take those addresses so can I give him the ip address of mx.zoho.com and mx2.zoho.com 165.254.168.50 165.254.167.50 to put in tiny dns? Will this ever change if they do will you notify everyone so that we can change the mx record to point to the new ips?