emx.fiserv.com has no MX records.
Question and response
Question
dig emx.fiserv.com. MX
Answer
The response has no answer records.
Authority
fiserv.com. 300 SOA dns2.p07.nsone.net. domainadmin.firstdata.com. 763100884 1200 180 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0