More than 55 million emails to date have been inspected as part of the Mimecast ESRA program, all of which had passed through the organization's incumbent email security vendor. Completed ESRA assessments have found more than 12,400,000 pieces of spam, 9,055 emails containing dangerous file types, 1,844 known and 691 unknown emails with malware attachments, and 18,971 impersonation attacks missed by incumbent providers and delivered to users' inboxes. About Mimecast Mimecast (NASDAQ:MIME) makes business email and data safer for 28,200 customers and their millions of employees worldwide. Founded in 2003, the company's next-generation cloud-based security, archiving and continuity services protect email and deliver comprehensive email risk management.