ns5.regions.com has no MX records.
Question and response
Question
dig ns5.regions.com. MX
Answer
The response has no answer records.
Authority
regions.com. 3600 SOA ns5.regions.com. dnsadmin.regions.com. 2014026472 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0