发送选项 meaning in English

deliveryoptio
sending options

Configures mail sending options
配置邮件发送选项。
Properties for more information about these message sending options
有关这些消息发送选项的更多信息，请参见
Configures simple mail transport protocol smtp mail sending options
配置简单邮件传输协议( smtp )邮件发送选项。
Features not described in detail in this article , such as message flags , mail delivery options , and folder operations , can vary depending on the backend you use
本文中没有详细描述的功能（例如，邮件标志、邮件发送选项以及文件夹操作）可能随着使用的后端的不同而改变。