[8] Clearswift extended the MIMEsweeper line to include web and instant messaging filtering.

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

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

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

[19] Clearswift has its main engineering office based in Arlington Business Park[20] (Theale, UK).