o4.ptr4861.prehire.pwc.com has no MX records.
Question and response
Question
dig o4.ptr4861.prehire.pwc.com. MX
Answer
The response has no answer records.
Authority
pwc.com. 600 SOA pdns1.cscdns.net. us_domain\.registrar.pwc.com. 734379244 900 600 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0