Corporate venturing units of US-based search engine Google and US-based media company International Data Group have backed Yesware, an e-mail tracking system, in a $4m round.
Google Ventures and IDG Ventures were joined in the series A round by venture firms Foundry Group and Golden Venture Partners.
Last year Yesware raised $1m backed by corporate venturing unit Google Ventures, venture capital firm Foundry Group and several angel investors.