They need to be configured on each desktop,which includes issuing a digital certificate to each user (for encryption and digital signature),and ensuring that a proper security profile is configured within the e-mail client.

• 它们需要配置到每个桌面系统，包括向每个用户发数字证书（用于加密和数字签名）并确保在每个电子邮件客户端都配置了合适的安全配置文件。