下面介绍最后一个、也是功能最强大、最值得推荐的选项，即创建一个自定义、可重用的扩展活动。
The last, most robust, and most recommended option that will be covered here is to create a custom, reusable, extension activity.
在这种情况下，我创建了一个自定义活动，可以用来发送一个简单的工作流程，通过电子邮件，邮件传输协议。
In this case, I have created a Custom Activity that can be used to send email messages from a workflow through Simple mail Transfer Protocol.
应用推荐