mcdlv.net has no MX records.
Question and response
Question
dig mcdlv.net. MX
Answer
The response has no answer records.
Authority
mcdlv.net. 86400 SOA pdns177.ultradns.com. dev.mailchimp.com. 2012103790 86400 86400 86400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0