I get copies of the posts in moodle.org which I have subscribed to saying "This is a copy of a message posted in Moodle in English". For me a message (in Moodle) is something I write after clicking on the button called "Message" on sombody's profile. Since I also get (annoying) private messages from moodle.org, these genuine "messages" annoy me too.
You can change you preferences for this at Home ▶︎ Dashboard ▶︎Preferences ▶︎ User account ▶︎ Notification preferences.
Scroll down to 'Forum' and change the 'Email' column settings to 'Off'.
This should fix you problem.