The marketing relationship management company has now raised more than $42m, after IDG Ventures invested in it for a third time.

US-based customer engagement technology provider Appboy completed a $20m series C round on Wednesday featuring IDG Ventures USA, which forms part of media firm International Data Group’s corporate venturing network.

Venture capital firm Battery Ventures led the round, with participation from all Appboy’s existing investors: InterWest Partners, Icon Venture Partners, Blumberg Capital, T5 Capital, Bullpen Capital and Accelerator Ventures.

Appboy supplies customer relationship software that helps marketers engage audiences through mobile and digital channels. The series C funding will support…