smtp.swecogroup.com has no MX records.
Question and response
Question
dig smtp.swecogroup.com. MX
Answer
The response has no answer records.
Authority
swecogroup.com. 3600 SOA ns1-01.azure-dns.com. domain.sweco.se. 2016102288 3600 600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0