mailout.ics.forth.gr has no MX records.
Question and response
Question
dig mailout.ics.forth.gr. MX
Answer
The response has no answer records.
Authority
ics.forth.gr. 7200 SOA dns1.ics.forth.gr. noc.ics.forth.gr. 1772007135 3600 7200 1209600 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0