Performance based ad net Q Interactive has acquired e-mail marketer Postmaster Direct. Since Q Interactive is focused on behavioral targeting, which is receiving a great deal of scrutiny from federal legislators and regulators, Postmaster Direct’s emphasis on “double opt-in” marketing programs is designed to insulate it from the sort of trouble that has plagued other companies in the space. Q Interactive sought out Direct Postmaster to quickly add more publishers to its own e-mail ad net. Terms of the deal weren’t disclosed. Release