mx2a1.comcast.net has no TXT records.
Question and response
Question
dig mx2a1.comcast.net. TXT
Answer
The response has no answer records.
Authority
comcast.net. 900 SOA dns101.comcast.net. domregtech.comcastonline.com. 2008258640 7200 3600 1209600 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0