mailserver.servidoraweb.net has no TXT records.
Question and response
Question
dig mailserver.servidoraweb.net. TXT
Answer
The response has no answer records.
Authority
mailserver.servidoraweb.net. 86400 SOA nut1.nuthost.com. servers.servidoraweb.com. 2022040805 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0