Question and response
Question
dig mx.CENTURYLINK.NET. TXT
Answer
mx.centurylink.net. 300 TXT "v=spf1 a include:_spf.centurylink.syn-alias.com -all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0