mail.sfl.com.mx has no NS records.
NS records for this zone are defined at sfl.com.mx.
NS records for this zone are defined at sfl.com.mx.
Question and response
Question
dig mail.sfl.com.mx. NS
Answer
The response has no answer records.
Authority
sfl.com.mx. 86400 SOA ns152.hostgator.mx. root.mx152.hostgator.mx. 2026022201 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0