ep2.telekurs.com has no MX records.
Question and response
Question
dig ep2.telekurs.com. MX
Answer
The response has no answer records.
Authority
ep2.telekurs.com. 300 SOA a1-232.akam.net. dnsadmin.six-group.com. 2008051453 3600 900 2419200 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0