MessageLabs launches encryption service, InfoWorld, 30 Mar 2005

“A new service from e-mail security vendor MessageLabs (Profile, Products, Articles) uses encryption to protect e-mail sent between business partners over the Internet, the company announced Wednesday…MessageLabs customers that want to use the service designate an e-mail domain that will be used to send the encrypted e-mail, and provide the domains of trusted partners who will engage in secure e-mail exchanges. MessageLabs' servers ensure that e-mail sent to and from the designated domains is secured using TLS (Transport Layer Security) encryption. E-mail traffic to all other domains is sent "in the clear" using just SMTP (Simple Mail Transfer Protocol), the company said�

Full story at http://www.infoworld.com/article/05/03/30/HNmessagelabs_1.html