Rate limiting restricts how fast you can send to a provider. Learn how throttling works and how to reduce deferrals.
Email rate limiting is when a receiving provider restricts the speed or volume of messages it will accept from a sender. It’s often used to protect users from abuse and to control server load.
If you hit rate limits, the fix is pacing: reduce concurrency, spread volume over time, and prioritize engaged recipients. Stable patterns usually recover faster than bursts.