mobile.tre.se has no MX records.
Question and response
Question
dig mobile.tre.se. MX
Answer
The response has no answer records.
Authority
mobile.tre.se. 600 SOA ns.hi3gaccess.se. hostmaster.tre.se. 2026030400 14400 3600 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0