P-EncryptMail For Outlook
P-EncryptMail for Outlook is an add-in for Microsoft Outlook (2000 and up). The add-in lets you to encrypt your e-mail in the P-EncryptMail format directly in Microsoft Outlook. You can encrypt and decrypt any message thats already in any outlook folder. You can also encrypt messages and send them to other people.
You can get detailed information about connector on the product page http://www.cadabrasoftware.com/Default.aspx?Page=PEMAILOL