已发送邮件的奇怪行为

[Jonathan5]

这纯粹是猜测，但也许用户已将某个类别、主题或标签设为静音（并且可能没有关于不发送电子邮件的原因的日志）。

我曾有过类似的经历，但最终没有详细研究：

Query for users' email settings

How could I find out how many users have each email setting? I’m asking as only about a tenth of users watching a topic are being emailed post notifications. Thank you.