Question and response
Question
dig tmxmailsmtp.telmex.com. PTR
Answer
The response has no answer records.
Authority
telmex.com. 300 SOA ns8.telmex.com. dominios.telmex.com. 657239972 10800 3600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0