How to resolve the '550 sender verify failed' error message

Mail servers have introduced “Sender Address Verification” or “Callback Verification” as an anti-spam technique. The email will be rejected by the mail server with the error message “550 Sender verify failed” if it is unable to confirm the sender’s address.This article explains why you could receive “550 Sender verify failed” errors when attempting to send an email and offers a solution.Contents Table of

Problem

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

550 Sender verify failed

Cause

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.

Let us say you add a parked domain, an add-on domain, or—if you are a reseller—a whole cPanel account. You must also set up the MX entries in cPanel to use the external email provider if the domain’s MX records—as configured at the domain registrar—point to one. You also need to create the email accounts you wish to use for message sending in cPanel.

Resolution

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.For information about how to manage e-mail accounts in cPanel.
• If the domain uses a remote e-mail provider, make sure the MX entries are set correctly in cPanel:
  1. Log in to cPanel.If you do not know how to log in to your cPanel account.
  2. Open the Remote MX Wizard:
     • If you are using the Jupiter theme, on the Tools page, in the Email section, click Remote MX Wizard:
     • If you are using the Paper Lantern theme, in the EMAIL section of the cPanel home page, click 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.
     For information about how to manage individual MX entry records in cPanel.