Send s/mime or microsoft purview encrypted emails in outlook using a work or school account with a qualified microsoft 365 subscription. Users can't sign or encrypt them by using s/mime. Learn how to use encryption and other security settings to protect messages sent from outlook.
You can use encryption and digital signatures in new outlook, classic outlook, and outlook on the web for work or school accounts to increase the security of messages. To apply irm protection, s/mime signature and encryption must be removed from the message 在“ Email安全性 ”选项卡上的“ 加密电子邮件 ”下,选择“ 加密传出邮件的内容和附件 检查”框。 若要更改其他设置(例如选择要使用的特定证书),请选择 “设置 ”。 选择完设置后,选择“ 确定 ”以保存更改。