crmail2.infimail.com has no NS records.
NS records for this zone are defined at infimail.com.
NS records for this zone are defined at infimail.com.
Question and response
Question
dig crmail2.infimail.com. NS
Answer
The response has no answer records.
Authority
infimail.com. 86400 SOA infimail.com. Postmaster.infimail.com. 637748924 10800 3600 172800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0