iris.iberlayer.com has no MX records.
Question and response
Question
dig iris.iberlayer.com. MX
Answer
The response has no answer records.
Authority
iberlayer.com. 300 SOA ixion.iberlayer.com. admin.iberlayer.com. 2026020301 43200 300 864000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0