HTC P3400, User Manual, Page: 66 / 211

Synchronizing Information and Setting Up E-mail Security 65
Digitally sign and encrypt all messages
ActiveSync allows you to set up S/MIME e-mail encryption and signing.
You must obtain a valid certificate to sign and encrypt e-mail messages
successfully.
1. Tap Start > Programs > ActiveSync .
2. Tap Menu > Options .
3. Select the E-mail information type, and tap Settings . On the E-mail
Sync Options screen, tap
Advanced
.
4.
Do one or both of the following:
• To sign all your outgoing e-mail messages so that recipients can
be certain that the messages were sent by you and have not been
altered in any way, select the
Sign all outgoing e-mail messages
check box.
• To encrypt all your outgoing e-mail messages so that the
contents of your messages are protected from being viewed by
anyone other than the intended recipients, select the
Encrypt all
outgoing e-mail messages check box.
5. Tap Choose Certificate to select a certificate for signing or
encrypting outgoing e-mail messages.
You can select certificates to sign or encrypt e-mail messages
individually if you do not choose to sign or encrypt all outgoing
e-mail. For information about signing and encrypting individual
messages, see “Individually sign and encrypt a message” in Chapter 7.