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Clearswift Limited
Industry Computer security
Founded UK (1982)
Headquarters Theale, Berkshire, UK
Number of locations
UK, USA, Germany, Japan, Australia
Area served
Products SECURE Email Gateway, SECURE Web Gateway, SECURE File Gateway, SECURE ICAP Gateway, SECURE Exchange Gateway, Critical Information Protection Server & Agent, ARgon for Email
Services Product support, Security consulting
Revenue £20.8m (2012)[1]
Owner Lyceum Capital
Number of employees

Clearswift is an information security company based in the UK. It provides cyber-security solutions to protect business's data from internal and external threats.


Clearswift was founded as NET-TEL in 1982.[2][3] One of the co-founders, John Horton, had previously worked at GEC and Acorn Computers.[4]

In 1988, NET-TEL launched Route400, the world's first mail client for MS-DOS (using the X.400 protocol). It was later ported to other platforms.[5][6]

1998, NET-TEL switched its main business to content filtering, as the popularity of the Microsoft Exchange Client took away the mail client market.[6]

2001, NET-TEL was rebranded as Clearswift, after a round of venture capital fundraising.[7]

2002, Clearswift acquired Content Technologies from Baltimore Technologies, along with the MIMEsweeper brand.[8]

Clearswift extended the MIMEsweeper line to include web and instant messaging filtering. These were marketed as protecting against the leakage of confidential company information on social networking sites - Clearswift argues that instead of banning Web 2.0 sites and services entirely, businesses can actually gain a competitive advantage by making use of them, provided their use is monitored.[9][10]

2003, the company received $6.07 million from its shareholders, including venture capital funds managed by Amadeus Capital Partners, BA Capital Partners, Cazenove Private Equity, and Kennet Partners.[11] Also, it was reported that Clearswift were the providers of a new email filtering system at the House of Commons, responsible for blocking Welsh language emails as "inappropriate content", and preventing MPs receiving copies of a Sexual Offences Bill.[12] Clearswift would not confirm that the House of Commons was a customer, citing customer confidentiality reasons.[7]

April 2005 Clearswift began to market an SMTP appliance (email gateway) based upon the technology.[13]

January 2008, failure to renew a domain name caused loss of email services to 5% of Clearswift's customers.[14]

Dec 2009, Clearswift sold the Deep-secure, Bastion and Flashpoint products in to a spin-off company, "Deep Secure".[15]

November 2011, Clearswift was sold to Lyceum Capital.[16]

August 2012, Clearswift acquired Jedda Systems Pty Ltd.[17] in order to provide endpoint DLP in conjunction with its gateway based network DLP and provide growth.[18]

February 2013, Clearswift acquired Microdasys in order to strengthen its web product line.[19]

Research & Development[edit]

Clearswift has its main engineering office based in Arlington Business Park[20] (Theale, UK). A smaller engineering office is in Adelaide, Australia which was part of the Jedda acquisition.[21]

External links[edit]