ns1.autotask.com has no MX records.
Question and response
Question
dig ns1.autotask.com. MX
Answer
The response has no answer records.
Authority
autotask.com. 180 SOA ns1.autotask.com. tharris.autotask.com. 2008010851 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0