Responsys, a Redwood City, Calif. email marketing company, said it has acquired Loyalty Matrix, a privately held provider of predictive analytics and contact products. The amount of the deal was undisclosed.

Loyalty Matrix’s customers include 24 Hour Fitness, Apple, Chicago Sun-Times, and DraftFCB.

Here is a copy of the statement.

Last year, Responsys also acquired Inbox Marketing. Responsys has raised about $62 million in venture backing, from Accel, Foundation Capital, Redpoint and Sigma Partners.