Question : How to Solve Error 550 (Requested Action Not Taken – Mailbox Unavailable)?

What is Error 550?

Error 550 indicates that an email could not be delivered because the recipient's mailbox is unavailable. This can happen for reasons such as:

• The email address does not exist.
• The recipient’s mailbox is inactive or full.
• The recipient’s server rejected the email due to a policy violation.

Steps to Solve Error 550:

1. Verify the Recipient’s Email Address:
   • Double-check the email address for typos or errors. Even a small mistake (e.g., missing a letter or an incorrect domain) can lead to this error.
2. Ensure the Mailbox is Active:
   • Contact the recipient through an alternative method (e.g., phone, text) to confirm whether their email account is active and able to receive emails.
3. Check Your Content for Policy Violations:
   • Ensure your email does not contain elements that might trigger spam filters, such as:
     • Excessive links or large attachments.
     • Spammy keywords in the subject or body.
   • Follow best practices to avoid being flagged as a spam sender.
4. Authenticate Your Email:
   • Make sure your domain has proper SPF, DKIM, and DMARC records set up. These email authentication protocols improve trustworthiness with recipient servers.
5. Retry Sending the Email:
   • After verifying and resolving any issues, try sending the email again.
6. Use Bounce Management Tools:
   • If you are using an email marketing platform like Mailpro, check for bounce management options to identify and address problematic addresses automatically.

By following these steps, you can resolve Error 550 and improve the chances of successful email delivery. If issues persist, contact your email provider for further assistance.

See the List of Email Errors Here