Throttling

Also known as: Rate Limiting

The limiting of the number of emails a particular sender can send or that an ISP will receive. Can happen for a variety of reasons, both on the ESP and ISP side. You usually want to avoid it.

Additional Resources

• What is email throttline?, SendGrid
• All You Need To Know About Email Throttling, Debounce
• What is email throttling and how does it affect email marketing?, Benchmark