Email Security Firm GreatHorn Raises $13 Million

Waltham, MA-based email security firm GreatHorn has raised an additional $13 million in a new funding round technically filed as a Series A-1. The round was co-led by new investor RRE Ventures and existing investor .406 Ventures, with participation from other existing investors including Techstars Ventures, V1.VC and Uncork Capital.

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