mx.wwwmycheckfree.com has no NS records.
NS records for this zone are defined at wwwmycheckfree.com.
NS records for this zone are defined at wwwmycheckfree.com.
Question and response
Question
dig mx.wwwmycheckfree.com. NS
Answer
The response has no answer records.
Authority
wwwmycheckfree.com. 3600 SOA dns.wwwmycheckfree.com. hostmaster.wwwmycheckfree.com. 1425494130 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0