Broadwick, a provider of email marketing software, is on a fast growth curve.

The company said Tuesday it has added 491 clients already in 2005 and recently passed the 1,500 mark in total customers. Its IntelliContact Pro software includes a variety of applications for creating, sending and tracking permission-based email newsletters and surveys.

Among Broadwick’s customers are Super 8 Motels and International Paper.

The company has also struck a variety of partnerships in recent months, including deals with SWsoft, Template Monster, ClickTracks and InternetSeer.