Citi Ventures and existing backer Slack Fund helped the communications API provider take its overall funding to more than $55m.

US-based communications software provider Nylas secured $25m on Tuesday in a series B round featuring Slack Fund and Citi Ventures, representing messaging platform developer Slack and financial services group Citi respectively. Venture capital firm 8VC and VC fund Round13 Capital co-led the round, which included Spark Capital and ScaleUp and which boosted the company‚Äôs overall…

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