relay3.MIRALOGIC.RU has no MX records.
Question and response
Question
dig relay3.MIRALOGIC.RU. MX
Answer
The response has no answer records.
Authority
MIRALOGIC.RU. 3600 SOA ns0.mirasystem.net. admins.mirasystem.net. 275 900 600 86400 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0