Prepare E-mail using a user's preferred composer or mail user agent.
使用用户喜欢的编辑器或邮件用户代理编写电子邮件。
The mail transfer agent receives the messages from another mail transfer agent, a mail user agent, or a mail submission agent.
邮件传输代理从另一个邮件传输代理、邮件用户代理或邮件提交代理处接收消息。
For example, if you're packaging a mail user agent or mail transport agent, there are some specific considerations that apply.
例如，如果您正在对一个邮件用户代理程序或邮件传输代理程序进行打包，那么有些特定的考虑事项适用于这种情形。
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