My b2evolution Version: Not Entered

As i can make some members being contributors or editor...or...they have more privileges, but also, may need to contact directly some group:
may a mass-mailer be integrated ?

and also a newsletter , done automatically for week to registered members: it could be sent with the last articles of the blogs chosen by the subscribers...
And admin could add their own contrib for an editorial of the letter.
any similar plugin ?