mail2.securedbill.com has no MX records.
Question and response
Question
dig mail2.securedbill.com. MX
Answer
The response has no answer records.
Authority
securedbill.com. 300 SOA dns2.p07.nsone.net. domainadmin.firstdata.com. 590215770 1200 180 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0