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Using Outlook with Exchange Server
Note There can be several reasons why a digital signature is not valid. For example,
the sender’s certificate may have expired, it may have been revoked by the
certificate authority, or the server that verifies the certificate is unavailable.
Contact the sender to report the problem.
To digitally sign and encrypt all messages
You can set up ActiveSync to digitally sign and encrypt all outgoing
messages. 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:
• T
o 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.
• T
o 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.
Ch10_English_Manual.indd 161 2007/5/28 下午 06:41:27