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When sending to an email address results in a hard bounce or spam complaint, Resend places this address on the Suppression List. Future emails to addresses on the list will be marked as suppressed and won’t be delivered until the address is removed.
We place emails on the Suppression List to protect domain reputation, both yours and ours. Sending an email to a known hard bounce recipient can damage domain reputation and affect email deliverability.

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Reasons emails are placed on the Suppression List

Here are some possible reasons an email address is placed on the Suppression List:
  • The recipient’s email address contains a typo.
  • The recipient’s email address doesn’t exist.
  • The recipient’s email server has permanently blocked delivery.
  • The recipient has marked a previous delivery as spam.

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What happens when you send to an address on the Suppression List?

Whenever you send an email with Resend, we check if the recipient is on the suppression list. If they are, we’ll suppress the delivery to prevent damaging your sender reputation and our infrastructure. Suppressed emails will appear with a suppressed status in your Emails dashboard: Email Suppression in Dashboard

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View suppression details

You can view the reason an email was suppressed on the Emails page:
  1. Open the Emails page and search for the recipient’s email address in question.
  2. Click on the email to view its details.
  3. The suppression details will show suggested fixes to help you resolve the issue.

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Removing an email address from the Suppression List

You may be able to send a message to the same recipient in the future if the issue that caused the original bounce or complaint is resolved and the email address is removed from the Suppression List.
Remember, if you do not address the issue that caused the email to bounce, the email address will return to the Suppression List the next time you attempt to send to it.
To remove your recipient from the Suppression List, click on the suppressed email in the emails dashboard, and click Remove from suppression list.