1- is there a way to get the mails that a user sent ? not only the recieved Mails.
2- is there a possibility to save a user profile image and to call it (for each user) when loading for example "the user friends list" ?
The answer is "yes" to both questions, please look at the parameters of the respective methods in Unity and you'll see what you're looking for.
FRANCESCO CROCETTI @ SKARED CREATIONS
thank ! one more question 
..
what does the "isPublic" boolean do in the email object?, or what is it for ? to write public messages ? if yes, who will be the reciever ? or I missunderstood this. thanks
A "public" message is readable from everyone, even if it is explicitly intended for a person only. It's there to implement something like a social network public diary. The messages flagged as "private" cannot be listed/read by anyone but the destination user.
FRANCESCO CROCETTI @ SKARED CREATIONS
