They must scale the near-vertical base by climbing rocks and tree roots like ladders -- or take a longer switchback trail -- and then begin an arduous hike uphill, sliding on mud and grasping at alders and shrubs to pull themselves up.
As Sift expands scale and deepens its market penetration, it could attract takeover offers from email marketers like Constant Contact, Vertical Response, and Vocus, all of which are looking for new ways to reach consumers.