gateways.firstdata.com has no MX records.
Question and response
Question
dig gateways.firstdata.com. MX
Answer
The response has no answer records.
Authority
firstdata.com. 300 SOA dns2.p07.nsone.net. domainadmin.firstdata.com. 590216279 1200 180 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0