dc2skype15av01.es.uc.adp.com has no MX records.
Question and response
Question
dig dc2skype15av01.es.uc.adp.com. MX
Answer
The response has no answer records.
Authority
es.uc.adp.com. 60 SOA dc01exdnsgm.net.adp.com. hostmaster.adp.com. 2015070150 10800 3600 2592000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0