在收件人在 Gmail 中回复后跳过滴灌邮件。
在有人回复后仍然继续发送的滴灌邮件看起来很机械。现在，定时任务会检查 Gmail 中每个收件人的入站消息。在他们回复后，邮件序列会停止。我们追踪了两个时间戳：他们实际回复的时间和我们检测到回复的时间。
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Drip emails that keep going after someone replies back look robotic. Now the cron checks Gmail for inbound messages from each recipient before sending. If they've replied, the sequence stops. Two timestamps tracked: when they actually replied and when we detected it.