mx1.delphisolutions.com has no NS records.
NS records for this zone are defined at delphisolutions.com.
NS records for this zone are defined at delphisolutions.com.
Question and response
Question
dig mx1.delphisolutions.com. NS
Answer
The response has no answer records.
Authority
delphisolutions.com. 3599 SOA ns.integraonline.com. hostmaster.integraonline.com. 2008081201 2800 7200 604800 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0