dsl.hol.gr has no MX records.
Question and response
Question
dig dsl.hol.gr. MX
Answer
The response has no answer records.
Authority
dsl.hol.gr. 86400 SOA ns0.hol.gr. hostmaster.hol.gr. 2014022601 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0