This is not for intentionally spamming users e.g: Cold emailing users who did not subscribe to your app. This is to avoid unintentionally flooding your users wi

This is not for intentionally spamming users e.g: Cold emailing users who did not subscribe to your app. This is to avoid unintentionally flooding your users with email who have subscribed to your app. e.g: I ran my cron job 2 times because of a bug and it sent 2 emails for each user. Another example is retargeting email which are sent for every user visit. If a user visits multiple times on a day, you don't want to send more than 1 email on a single day. This API helps with that.