It has offices in London, Boston, Chicago, San Francisco, Dallas, Cape Town, Johannesburg, Melbourne, Sydney, Amsterdam, Hilversum, Singapore, Dubai, Bengaluru, Munich, Paris and Israel.

[16] Mimecast co-founder and former CEO, Peter Bauer, previously founded FAB Technology in the mid-nineties and sold it to Idion.

[18] Another significant former executive is Mimecast Chief Scientist Nathaniel Borenstein, who was amongst the original designers of the MIME protocol for formatting multimedia Internet electronic mail - he sent the world's first e-mail attachment on 11 March 1992.

[21][22] Its Mail Transfer Agent provides intelligent email routing based on server or user mailbox location.

Awareness Training Brand Exploit Protect In January 2021, a Mimecast security certificate was revealed to have been compromised, potentially allowing attackers to intercept communications with Microsoft-based email servers.