mail.smtpeter.com has no TXT records.
Question and response
Question
dig mail.smtpeter.com. TXT
Answer
The response has no answer records.
Authority
smtpeter.com. 60 SOA dns1.proxi.nl. hostmaster.copernica.com. 1772011276 14400 1800 86400 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0