Question and response
Question
dig spfb.itesm.mx. TXT
Answer
spfb.itesm.mx. 3600 TXT "v=spf1 ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:148.105.8.0/21 ~all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0