On what types of recipients do the encrypted message portal activity logs work?
加密邮件门户活动日志适用于哪些类型的收件人？
The encrypted message portal activity logs only capture events for external recipients by accessing the encrypted message portals. Any activities in email clients triggered by external recipients aren't recorded. For internal recipients, see the MailItemsAccessed mailbox-auditing action in Purview Audit (Premium) - Mail items accessed logs.
加密的邮件门户活动日志仅通过访问加密的邮件门户来捕获外部收件人的事件。 不会记录外部收件人触发的电子邮件客户端中的任何活动。 对于内部收件人，请参阅 Purview 审核 (Premium) - 邮件项目访问日志中的 MailItemsAccessed 邮箱审核操作。