ns2-ruth.pangaea.us has no MX records.
Question and response
Question
dig ns2-ruth.pangaea.us. MX
Answer
The response has no answer records.
Authority
pangaea.us. 3600 SOA NS37.WORLDNIC.COM. namehost.WORLDNIC.COM. 125091614 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0