Microsoft Exchange rejects all digital signatures
Originally Published: 2001-07-06
Last Modified: 2023-10-06
Article Number
000054720
Applies To
Sentry CA 3.6
Keon Certificate Authority
Microsoft Exchange Server
TechNote 0184
Issue
Microsoft Exchange rejects all digital signatures
Resolution
Microsoft Exchange Server requires that Exchange Service Pack 1 (or better)  be installed prior to being able to relay signed messages with S/MIME.  There is a setting in exchange that specifies whether  "clients can handle S/MIME".  Ensure that this setting is enabled.   Refer to the Microsoft documentation or readme files if there are further difficulties with Exchange Server configuration.
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