ns.pe3ny.net has no MX records.
Question and response
Question
dig ns.pe3ny.net. MX
Answer
The response has no answer records.
Authority
pe3ny.net. 1800 SOA ns.pe3ny.net. noc.pe3ny.net. 2026032701 3600 1800 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0