mx6.mobily.com.sa has no TXT records.
Question and response
Question
dig mx6.mobily.com.sa. TXT
Answer
The response has no answer records.
Authority
mobily.com.sa. 900 SOA gm-mlg-01.prod.mobily.lan. hostmaster.mobily.com.sa. 44610 10800 1080 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0