Google Inc. <GOOG.O> has received U.S. antitrust approval to acquire Web-based security provider Postini, U.S. officials said on Wednesday.

Antitrust authorities completed their review of the $625 million deal without taking any action to block it, the U.S. Federal Trade Commission said in a notice.

Google's Acquisition of Postini Gets Antitrust OK [washingtonpost.com]