mail.sender.crosscert.com has no NS records.
NS records for this zone are defined at crosscert.com.
NS records for this zone are defined at crosscert.com.
Question and response
Question
dig mail.sender.crosscert.com. NS
Answer
The response has no answer records.
Authority
crosscert.com. 3600 SOA ns.crosscert.com. admin.crosscert.com. 2026031402 1800 300 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0