---
title: "What Is Sending Throttling In SmartDelivery?"
description: "Learn what is sending throttling in SmartDelivery deliverability test."
url: https://helpcenter.smartlead.ai/en/articles/240-what-is-sending-throttling-in-smartdelivery
collection: "SmartDelivery"
updated: 2026-08-21
language: en
---

# What Is Sending Throttling In SmartDelivery?

Learn what is sending throttling in SmartDelivery deliverability test.

**Sending throttling** in SmartDelivery is a powerful feature that allows you to control the rate at which your emails are sent to different providers during a deliverability test. 

This is particularly useful when you want to simulate real-world sending conditions, ensuring that your email campaigns maintain high deliverability while avoiding triggering spam filters.

**How Does Sending Throttling Work?**

With sending throttling, you can choose between two main options for sending your test emails:

1.  **Simultaneous Sending:**
    

This option sends all emails to different providers **at once**, providing faster test results. It’s useful when you want a quick overview of your email's deliverability across different providers in a short period.

2.  **Sequential Sending (Throttled):**
    

In this option, emails are sent out **sequentially** with a set interval between each email. For example, you can choose to send one email every 5 or 10 minutes. This approach mimics slower, more natural sending patterns, which can help avoid triggering spam filters that flag sudden spikes in email traffic.

**Important Considerations for Automatic Tests**

If you're running an **automatic spam test**, it's essential to carefully configure both the **test frequency** and the **sending throttle rate** to avoid conflicts.

For instance:

-   If your automatic test is set to run **every 3 hours** but you’ve selected a throttle limit of sending **one email every 10 minutes**, you may receive a warning message. This is because the system will need enough time to complete the first test before starting a new one. If the test frequency is too frequent, the first test might still be ongoing, causing delays or interruptions.
    

To avoid issues:

-   Make sure your test frequency aligns with the throttle limit you’ve set, giving the system enough time to send all emails sequentially before starting the next test.