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Why are my email sends staggered?

A deferral indicates that an email couldn't be delivered on the current attempt.

We'll attempt delivery again at a later time for up to 72 hours. If delivery is still unsuccessful after 72 hours, the event becomes an expired event.

A preemptive deferral occurs when an email delivery system temporarily postpones sending messages because it anticipates that immediate delivery would violate recipient server policies or ISP limits, such as throttling, hourly limits, or connection caps.

This proactive approach helps prevent delivery failures and ensures compliance with external sending restrictions. We protect the sender's reputation by returning a preemptive deferral with the reason for the delay at this time and will retry delivery for up to 72 hours. Some preemptive deferrals include actions to help the sender avoid similar issues in the future.