u8553.col.agava.net has no MX records.
Question and response
Question
dig u8553.col.agava.net. MX
Answer
The response has no answer records.
Authority
col.agava.net. 10800 SOA ns1.reg.ru. hostmaster.ns1.reg.ru. 1675150657 14400 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0