How to encrypt \ password protect a email when sending an email few external users
We use exchange 2007 and outlook 2010. One of the users has asked, that they want to send an email to few external users and the email they send must me encrypted.
(something like they should be able to open by a password, don't know how it works)
Is there a way to do this? Any suggestions will be helpful. Please can some on post me step by step tutorials to achieve this.