world.excedodns.org has no MX records.
Question and response
Question
dig world.excedodns.org. MX
Answer
The response has no answer records.
Authority
excedodns.org. 3600 SOA global.excedodns.com. hostmaster.excedo.se. 1767041181 3600 900 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0