mailspool.core.kcom.com has no TXT records.
Question and response
Question
dig mailspool.core.kcom.com. TXT
Answer
The response has no answer records.
Authority
core.kcom.com. 28800 SOA ibex.kcom.com. hostmaster.kcom.com. 2013062501 28800 7200 604800 28800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0