omt.nfon.com has no MX records.
Question and response
Question
dig omt.nfon.com. MX
Answer
The response has no answer records.
Authority
nfon.com. 2560 SOA a.myradns.net. support.myrasecurity.com. 2770198669 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0