exchange.PLPOD.RU has no MX records.
Question and response
Question
dig exchange.PLPOD.RU. MX
Answer
The response has no answer records.
Authority
plpod.ru. 300 SOA ns.pledpodushkin.ru. admin.pledpodushkin.ru. 412202515 10800 3600 604800 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0