maillist.peak.org has no MX records.
Question and response
Question
dig maillist.peak.org. MX
Answer
The response has no answer records.
Authority
peak.org. 300 SOA ns1.peak.org. hostmaster.peak.org. 2026022504 300 900 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0