reserved-by-avm.ptr.network has no MX records.
Question and response
Question
dig reserved-by-avm.ptr.network. MX
Answer
The response has no answer records.
Authority
ptr.network. 3600 SOA ns1.reg.ru. hostmaster.ns1.reg.ru. 1757521541 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0