blackhole.tem.scaleway.com has no MX records.
Question and response
Question
dig blackhole.tem.scaleway.com. MX
Answer
The response has no answer records.
Authority
tem.scaleway.com. 3600 SOA nsa.scaleway.com. hostmaster.tem.scaleway.com. 2026021901 300 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0