mgmt.rts.se has no MX records.
Question and response
Question
dig mgmt.rts.se. MX
Answer
The response has no answer records.
Authority
mgmt.rts.se. 86400 SOA ns01.mgmt.rts.se. network.rts.se. 2023121305 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0