fifthns.com has no MX records.
Question and response
Question
dig fifthns.com. MX
Answer
The response has no answer records.
Authority
fifthns.com. 3600 SOA acglob.firstns.cc. support.anexia-it.com. 7 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0