mail1.opensolutionsasp.com has no NS records.
NS records for this zone are defined at opensolutionsasp.com.
NS records for this zone are defined at opensolutionsasp.com.
Question and response
Question
dig mail1.opensolutionsasp.com. NS
Answer
The response has no answer records.
Authority
opensolutionsasp.com. 300 SOA dns2.p07.nsone.net. domainadmin.firstdata.com. 727588826 1200 180 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0