sunny.scalahosting.com has no MX records.
Question and response
Question
dig sunny.scalahosting.com. MX
Answer
The response has no answer records.
Authority
scalahosting.com. 1800 SOA coco.ns.cloudflare.com. dns.cloudflare.com. 2397504334 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0