static.centurylink.net has no MX records.
Question and response
Question
dig static.centurylink.net. MX
Answer
The response has no answer records.
Authority
static.centurylink.net. 3600 SOA authns1.qwest.net. abuse.centurylink.net. 2220913000 10800 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0