mail01.netigate.se has no MX records.
Question and response
Question
dig mail01.netigate.se. MX
Answer
The response has no answer records.
Authority
netigate.se. 1800 SOA amit.ns.cloudflare.com. dns.cloudflare.com. 2397200833 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0