I suspect KLouis' translation might be rather better than the one from Google Translate ...!

It does appear you've fallen into the rather nasty trap from which escape is completely random. For some months now, you can expect all newsletter and e-mails in Greek and duplicates to arrive a few minutes later.

Just before you reach the point where you can take no point and are about to unsubscribe, the missives will magically revert back to your specified language which you've never changed in your settings. There will be no rhyme or reason for this, and it could equally move back to Greek at any moment.