Mail server permanently rejected message 5.3 0

The infamous "5.3.0" error!

The error message "5.3.0" is a generic error code returned by a mail server when it permanently rejects a message. The "5.3" prefix indicates that the error is related to the recipient's mailbox or account, while the "0" suffix is a generic code that can have different meanings depending on the mail server and its configuration.

Here are some possible reasons why a mail server might return a "5.3.0" error:

  1. Invalid recipient address: The recipient's email address is invalid, non-existent, or not properly formatted.
  2. Account suspension or deletion: The recipient's email account has been suspended or deleted, making it impossible to deliver the message.
  3. Mailbox quota exceeded: The recipient's mailbox has exceeded its storage quota, and the mail server is refusing to accept new messages until the quota is reduced.
  4. Recipient's email server configuration: The recipient's email server is configured to reject messages from your mail server, possibly due to spam or abuse issues.
  5. Domain or DNS issues: There are issues with the recipient's domain or DNS configuration, preventing the mail server from delivering the message.

To troubleshoot the issue, you can try the following:

  1. Verify the recipient's email address: Double-check that the recipient's email address is correct and properly formatted.
  2. Check the recipient's mailbox status: Verify that the recipient's email account is active and not suspended or deleted.
  3. Check the recipient's mailbox quota: If the recipient's mailbox is full, ask them to free up some space or reduce their quota.
  4. Check the recipient's email server configuration: If you suspect that the recipient's email server is configured to reject messages from your mail server, try contacting their IT department or email administrator for assistance.
  5. Check domain and DNS issues: Verify that the recipient's domain and DNS configuration are correct and functioning properly.

If none of these troubleshooting steps resolve the issue, you may want to contact the recipient's email administrator or IT department for further assistance.