Each user can get a personal certificate from a official certification entity with public and private key and associated with his/her email address. Then to sign emails you only need your certificate but in case you want to cypher you need de public key of the other person. What it is usually done, is to interchange a signed mail between the two users in order both have each other public keys. Then these users can send cyphered mails between them. The contact should be saved in the contacts folder and outlook should recognize the certificate. Bye. David Sierra Fernández sieferda@xxxxxxx JCYL Spain ________________________________ De: MJ [mailto:mjtech@xxxxxxxxx] Enviado el: martes, 14 de marzo de 2006 5:21 Para: [ExchangeList] Asunto: [exchangelist] RE: Mail security Q http://www.MSExchange.org/ Hi, http://www.MSExchange.org/ You could do that, but then users from other domains have to trust yours, even though they have no way of verifying it. Unless you're going to have a certificate from a public issuer such VerSign -----Original Message----- From: Praveen Ramaswamy [mailto:ramaswamy_praveen@xxxxxxxxx] Sent: Monday, March 13, 2006 10:58 PM To: [ExchangeList] Subject: [exchangelist] Mail security Q I am running on Exchange 2003 sp1 on windows 2003 sp1, some of our users want to digitally sign the mails and encrypt mails while sending mails to customers who are normally in different domains. What would be the best way to achieve this? Please let me know your views. Best regards Praveen R ________________________________ Yahoo! Mail Use Photomail <http://pa.yahoo.com/*http://us.rd.yahoo.com/evt=38867/*http://photomail.mail.yahoo.com> to share photos without annoying attachments. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: mjtech@xxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to info@xxxxxxxxxxxxxx ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: sieferda@xxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to info@xxxxxxxxxxxxxx