[1] Egress was founded in 2007 by Tony Pepper, Neil Larkins and John Goodyear.

[3] The company experienced an influx of customers following the introduction of the European Union’s General Data Protection Regulation in 2018.

[5] In April 2024, cybersecurity awareness training vendor KnowBe4 announced the acquisition of Egress Software with "plans to deliver a single platform that aggregates threat intelligence dynamically, offering AI-based email security and training that is automatically tailored relative to risk.

[8] In October 2013, Egress Switch was certified by CESG against Desktop and Gateway Email Encryption Security Characteristics as part of their Commercial Product Assurance program.

[1] As of April 2018[update] this certification lies with National Cyber Security Centre (NCSC) and eas extended until 20 December 2019.