mail4.fiserv.com has no TXT records.
Question and response
Question
dig mail4.fiserv.com. TXT
Answer
The response has no answer records.
Authority
fiserv.com. 300 SOA dns2.p07.nsone.net. domainadmin.firstdata.com. 763100885 1200 180 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0