mx-out.grnet.gr has no TXT records.
Question and response
Question
dig mx-out.grnet.gr. TXT
Answer
The response has no answer records.
Authority
grnet.gr. 600 SOA ns-pri.grnet.gr. dnsmgr.grnet.gr. 2026022407 86400 7200 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0