ulysse.ugr.be has no MX records.
Question and response
Question
dig ulysse.ugr.be. MX
Answer
The response has no answer records.
Authority
ugr.be. 3600 SOA ns1.destiny.be. webmaster.ulysse.ugr.be. 2025101001 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0