ipam.maxgigapop.net has no MX records.
Question and response
Question
dig ipam.maxgigapop.net. MX
Answer
The response has no answer records.
Authority
maxgigapop.net. 900 SOA ipam.maxgigapop.net. noc.maxgigapop.net. 825 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0