cpe.hcn.gr has no MX records.
Question and response
Question
dig cpe.hcn.gr. MX
Answer
The response has no answer records.
Authority
cpe.hcn.gr. 300 SOA dns-01.hcn.gr. office.hcn.gr. 2018476959 14400 3600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0