Zix provides cybersecurity, compliance and productivity solutions to 21,000 organizations, and cybercriminals have been leveraging the company’s reputation in a phishing campaign aimed at enterprises.

Email security company Armorblox said on Tuesday that it has observed an attack on customer environments across Microsoft Exchange, Office 365 and Google Workspace.

“Although the potential account exposure of this attack campaign was close to 75,000 mailboxes, our threat research team found that a select group of employees – usually across departments – were targeted within each customer environment,” Armorblox explained in a blog post.