电子邮件通过邮件传输代理、邮件发送代理及邮件用户代理发送。
E-mail is sent via mail transfer agents, mail delivery agents, and mail user agents.
如果目的帐户在本地机器上，邮件发送代理就会将消息直接分发到计划接收人的邮件箱中。
If the destination account is on a local machine, the mail delivery agent distributes the messages directly to the intended recipient's mailbox.
当将在线策略应用到目录时，安全服务器就把该策略发送给代理，而代理将其缓存在内存中。
When applying an online policy to a directory, the security server sends the policy to the agent, and the agent caches the policy in memory.
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