550 Sender verify failed’ error message

This article discusses why ‘550 Sender verify failed’ messages may occur when you try to send e-mail, and how to resolve the issue.


When you try to send an e-mail message, you receive the following SMTP error message:

550 Sender verify failed


This error message occurs when the sender e-mail account does not exist in cPanel, or when the domain’s MX entry records are misconfigured in cPanel.

For example, suppose you add a parked domain, an addon domain, or even an entire cPanel account (if you are a reseller). If the domain’s MX records (as set at the domain registrar) point to an external e-mail provider, you must also configure the MX entries in cPanel to use the external e-mail provider. Additionally, in cPanel you must create the e-mail accounts that you want to use to send messages.


To resolve this issue, follow these steps:

  • Make sure the e-mail account you are using to send messages actually exists in cPanel, and that you are using the correct username and password for SMTP authentication.
  • If the domain uses a remote e-mail provider, make sure the MX entries are set correctly in cPanel:
    1. Log in to cPanel.
    2. In the MAIL section of the cPanel home screen, click Remote MX Wizard:

      cPanel - Email - Remote MX Wizard

    3. Under Domain, select the domain you want to modify.
    4. Make sure the domain is configured to use the remote e-mail provider.