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 (External link) 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 (External link).
• 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 (External link) 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.