defcon-mailer.si.ecritel.net has no MX records.
Question and response
Question
dig defcon-mailer.si.ecritel.net. MX
Answer
The response has no answer records.
Authority
si.ecritel.net. 60 SOA ns-a.ecritel.fr. postmaster.ecritel.fr. 2026022601 14400 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0