smtp-cld.megapath.com has no MX records.
Question and response
Question
dig smtp-cld.megapath.com. MX
Answer
The response has no answer records.
Authority
megapath.com. 300 SOA ns1.megapath.com. support.megapath.com. 1753889482 14400 3600 2718281828 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0