mx.granderiver.net has no TXT records.
Question and response
Question
dig mx.granderiver.net. TXT
Answer
The response has no answer records.
Authority
granderiver.net. 900 SOA nsa.vtx1.net. fieldopadmin.vtx1.net. 82 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0