550 mail relay not permitted gsuite

The infamous "550 mail relay not permitted" error!

This error typically occurs when a mail server (in this case, a G Suite mail server) refuses to accept an email message because it's trying to relay mail through the server without proper authentication or authorization.

Here are some common reasons why you might see this error:

  1. Incorrect SMTP settings: Double-check your email client's SMTP settings to ensure they're correct. Make sure the server name, port, username, and password are all correct.
  2. Lack of authentication: G Suite requires authentication to send emails through its servers. Ensure that your email client is using the correct username and password to authenticate with the G Suite server.
  3. Relaying not allowed: G Suite has strict policies against relaying mail through its servers. If you're trying to send emails through a third-party mail server, it may be blocked.
  4. SPF or DKIM issues: G Suite uses SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) to verify the authenticity of emails. If your domain's SPF or DKIM records are not set up correctly, it may cause issues with email delivery.

To resolve this issue, try the following:

  1. Check your email client's settings: Verify that your email client is using the correct SMTP settings and authentication credentials.
  2. Enable less secure apps: If you're using a third-party email client, try enabling "Less secure apps" in your G Suite account settings. This may allow the client to authenticate with the G Suite server.
  3. Set up SPF and DKIM: Ensure that your domain's SPF and DKIM records are set up correctly. You can do this by creating a TXT record in your domain's DNS settings.
  4. Use G Suite's SMTP relay: Instead of using a third-party mail server, try using G Suite's built-in SMTP relay service. This service allows you to send emails directly through the G Suite server.
  5. Contact G Suite support: If none of the above solutions work, you may want to contact G Suite support for further assistance. They can help you troubleshoot the issue and provide guidance on how to resolve it.