master.zixcorp.com has no TXT records.
Question and response
Question
dig master.zixcorp.com. TXT
Answer
The response has no answer records.
Authority
zixcorp.com. 300 SOA ns01.zixcorp.com. noc.zixcorp.com. 2026030201 3600 300 2419200 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0