peak10.net has no MX records.
Question and response
Question
dig peak10.net. MX
Answer
The response has no answer records.
Authority
peak10.net. 900 SOA ns1.clt.peak-10.com. abuse.peak-10.com. 2015063351 28800 7200 604800 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0