Here are some tips for new recruits (or anybody) for not getting scammed:
1) Never give away crowns/CE to people who you do not know well or at all, be it by mail, trade, etc.
2) It is strongly recommended against giving people money for unbinding, since some cannot be trusted. Check their legitimacy by looking in the bazaar, or asking around inconspicuously. Most people can be trusted, but just check to make sure.)
3) Whenever making a trade, do not press confirm before your trader puts their item in the box. I got scammed out of 6k crowns this way