cosmote.net has no MX records.
Question and response
Question
dig cosmote.net. MX
Answer
The response has no answer records.
Authority
cosmote.net. 900 SOA ns1.cosmote.net. ripe.cosmote.gr. 2025111701 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0