新闻简报：您只需为所发送的邮件付费，而非为未订阅的用户付费。价格仅为 beehiiv 等平台的几分之一。开源方案：可自行托管，或选择 mailcheap.ai。
Newsletters where you pay for the emails you send, not for dormant subscribers, at a fraction of the price of beehiiv and the like. Open source: self-host it, or use mailcheap.ai.
