mail.outtask.com has no MX records.
Question and response
Question
dig mail.outtask.com. MX
Answer
The response has no answer records.
Authority
outtask.com. 300 SOA ns0.concur.net. eoperator.concur.com. 2016121304 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0