The two most important metrics for email marketing are open rate and click-through rate. If your emails aren't opened, subscribers will never see your full marketing message, and if they open them but don't click through to your site, your emails won't convert.
这是一种分层可选协议的设计：核心字段（id、meta、capabilities、config）是必须的，其余功能按需实现。一个简单的 webhook 通道可以只实现 outbound；一个功能完整的平台可以实现全部 Adapter。
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