gr has no MX records.
Question and response
Question
dig gr. MX
Answer
The response has no answer records.
Authority
gr. 1800 SOA grdns.ics.forth.gr. hmaster-info.ics.forth.gr. 2602250091 3600 180 5184000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0