Returnpath.com has raised $4.2 million in a Series G round, according to an SEC filing.

The New York-based email intelligence startup has previously raised $16 million from investors including New York-based Union Square Ventures.

Return Path’s email intelligence solutions utilizes sets of data to maximize the performance and accountability of email, build trust across the entire email ecosystem and protect users from spam and other abuse.

Founded in 1999, Returnpath.com is led by Chairman and CEO Matt Blumberg.