relay.maxnet.ua has no MX records.
Question and response
Question
dig relay.maxnet.ua. MX
Answer
The response has no answer records.
Authority
maxnet.ua. 86400 SOA ns.maxnet.ua. admin.maxnet.ua. 2006040546 28800 14400 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0