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How to Fix ‘550 Sender verify failed’ Error in cPanel

If you’re managing a website or email server, encountering email delivery issues can be frustrating. One common problem that can disrupt your email communication is the ‘550 Sender verify failed’ error. This error occurs when you’re trying to send an email, and the recipient’s server rejects it due to verification issues with the sender’s email address. This blog post will guide you through understanding this error and provide detailed solutions to fix it in cPanel.

This blog is a part of our cPanel server management services where we make sure your cPanel server works efficiently with any issues.

Understanding the ‘550 Sender verify failed’ Error

The ‘550 Sender verify failed’ error is a response from the recipient’s mail server that indicates it could not verify the email address of the sender. This verification process is a part of the server’s security measures to prevent spam and ensure that the email is coming from a legitimate source. When the sender’s email server does not properly respond to this verification request, the email is rejected, resulting in this error.

Common Causes of ‘550 Sender verify failed’ Error:

  • Incorrect Email Settings: Misconfiguration in your email settings can lead to verification failure.
  • SPF Record Issues: An incorrect or missing Sender Policy Framework (SPF) record can cause this error.
  • Server Misconfiguration: The recipient’s server might have strict verification settings that reject emails from servers that do not meet specific criteria.

How to Fix the ‘550 Sender verify failed’ Error

Fixing the ‘550 Sender verify failed’ error involves checking and correcting your email and server settings. Here’s a step-by-step guide to resolve this issue in a cPanel environment:

Step 1: Verify Your Email Settings

  • Check Email Account Existence: Ensure that the email account you’re sending from exists on your cPanel server. You can verify this by logging into cPanel and navigating to the ‘Email Accounts’ section.
  • Use Correct Email Authentication: Ensure that your email client (e.g., Outlook, Thunderbird) is configured with the correct authentication settings. Use your full email address as the username and the corresponding password.

Step 2: Review and Update SPF Records

  • Access the DNS Zone Editor: Log into cPanel and navigate to the ‘DNS Zone Editor’ under the ‘Domains’ section.
  • Check Your SPF Record: Ensure that you have a valid SPF record that authorizes your server to send emails on behalf of your domain. If missing, add an SPF record in the format: v=spf1 a mx ip4:YOUR_SERVER_IP ~all.
  • Update DNS Records: Save any changes and wait for the DNS propagation, which can take up to 48 hours.

Step 3: Adjust Email Routing

  • Configure Email Routing: In cPanel, go to ‘Email Routing’ under the ‘Email’ section. Ensure that your domain’s email routing is set to ‘Local Mail Exchanger’ if the email is hosted on the same server. Otherwise, choose the appropriate setting.

Step 4: Contact the Recipient’s Email Administrator

  • If you’ve followed the above steps and the issue persists, the problem might lie with the recipient’s server settings. Contact the recipient’s email administrator or support team and inform them of the issue. They may need to adjust their verification settings or whitelist your domain.


The ‘550 Sender verify failed’ error can be a hindrance to effective email communication, but it’s usually fixable with the right approach. By verifying your email settings, ensuring accurate SPF records, and adjusting email routing, you can overcome this issue. Remember, email delivery problems can stem from various factors, so a thorough investigation is crucial. If you continue to experience difficulties, consider reaching out to your hosting provider or a professional email solutions provider for further assistance.

By maintaining correct configurations and understanding the intricacies of email communication, you can ensure smooth, uninterrupted service. Remember, the goal is not just to fix the immediate error but to establish a reliable and secure email environment for your domain.