Fix Transactional Email blocked domain

Reviewed on May 22, 2026

Problem

My Transactional Email domain is blocked.

Cause

Domains are automatically blocked to protect the domain reputation when you have a high rate of undelivered emails.

The potential causes of undelivered emails are:

• Sending test emails to example.com or non-existing email addresses
• Importing or using a mailing list with inactive email addresses
• Sending test emails using your production environment

Solution

Identify the cause and take action to prevent blocking your domain

• Do not send emails to example.com.
• Do not send emails to non-existing or unverified email addresses.
• Use webhooks to delete emails that have soft bounced and hard bounced.
• Verify if loops or cron jobs are using wrong recipients.
• Keep a clean list of engaged users and delete email addresses of recipients that do not engage with your content.
• Separate test and production environments.

In general, follow best practices for deliverability to avoid blocking your domain.

Contact Scaleway Support

Contact Scaleway Support and specify that your domain is blocked.

• Confirm that you have identified and corrected the cause.

The support team will unblock your domain manually after verification.