mail.serverplan.com has no TXT records.
Question and response
Question
dig mail.serverplan.com. TXT
Answer
The response has no answer records.
Authority
serverplan.com. 3600 SOA ns1.dns4userver.com. server.serverplan.com. 2025120200 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0