Sources: Mimecast, which makes email security tools, is exploring a possible sale or investment; Mimecast went public in 2015 and is valued at $4.5B (Wall Street Journal)

Wall Street Journal:
Sources: Mimecast, which makes email security tools, is exploring a possible sale or investment; Mimecast went public in 2015 and is valued at $4.5B  —  Cybersecurity-software company has market value of about $4.5 billion  —  Email-security software maker Mimecast Ltd. is exploring a possible sale …