### [Email Address in Suppression List](https://wpmailsmtp.com/docs/sendlayer-email-in-suppression-list/)

**Published:** May 25, 2026
**Author:** David Ozokoye

**Content:**

**Note**: This guide applies to the [SendLayer mailer](https://wpmailsmtp.com/docs/how-to-setup-the-sendlayer-mailer-using-quick-connect/ "SendLayer") in WP Mail SMTP.

## What This Error Means

The recipient email address you’re trying to send to is in SendLayer’s suppression list. A suppression list is an automatic block list that email services maintain. It prevents delivery to addresses that have previously bounced, marked messages as spam, or unsubscribed. SendLayer adds addresses to this list automatically to protect your sending reputation.

## Common Causes

- Recipient email previously hard-bounced (the address doesn’t exist or is invalid)
- Recipient previously marked an email sent through SendLayer email as spam
- Test email address added to suppression during testing with an invalid address
- Address manually added to suppression list

## How to Fix

Here is the complete step-by-step guide to resolving the error.

### Step 1: Remove the Address From the Suppression List

Before removing an address from the suppression list, confirm the recipient email address is real and correctly spelled. If the address is invalid, then removing it will cause another bounce and re-suppression.

**Important**: Only remove addresses from the suppression list when you’re confident the address is valid. Re-adding an invalid address will cause more bounces and damage your sending reputation.

To manage your suppression list, log in to your [SendLayer](https://app.sendlayer.com "SendLayer") account. Once you’re logged in, click **Suppressions** in the sidebar.

![Click Suppressions in the sidebar](https://wpmailsmtp.com/wp-content/uploads/2026/05/dashboard-click-suppressions.png)Then, enter the recipient email address in the **Search suppressions** field.

![Search for the recipient email address](https://wpmailsmtp.com/wp-content/uploads/2026/05/suppressions-search-email.png)Next, click the **trash** icon in the **Remove** column next to the email address.

![Click the trash icon to remove the email](https://wpmailsmtp.com/wp-content/uploads/2026/05/suppressions-click-remove.png)In the overlay that appears, click **OK** to confirm the removal.

![Click OK to confirm removal](https://wpmailsmtp.com/wp-content/uploads/2026/05/suppressions-confirm-remove.png)### Step 2: Send a Test Email

To test the fix, log in to your WordPress admin area and go to **WP Mail SMTP » Tools**, click the **Email Test** tab, enter the previously suppressed address in the **Send To** field, leave the **HTML** toggle ON, and click **Send Email**.

![Test email tab](https://wpmailsmtp.com/wp-content/uploads/2024/10/test-email-tab-1024x1002.png)Once done, look for the success message and confirm the email arrived in the inbox.

## Notes

- Only remove addresses from the suppression list if you’re confident the address is valid and SendLayer suppressed it in error. Re-adding an invalid address will cause more bounces.
- If you’re testing with a real address and SendLayer suppressed it, it’s safe to remove.
- For the test email flow in WP Mail SMTP, try a different email address if the current one is suppressed and you’re testing connectivity.

That’s It! You now know how to fix the ‘Email Address in Suppression List’ error in SendLayer and get your emails sending again through WP Mail SMTP.

**Categories:** SendLayer Errors, Error Library

---