In this article, we explain why the “550 Sender Verify Failed” error occurs when sending an email and how you can fix it.
This error appears when the mail server cannot verify the sender’s email address. It usually happens when the sender’s email account does not exist on the mail exchanger or within the cPanel account handling the domain.
For example, this issue can occur if you recently added an add-on domain, or if you are using a parked domain whose MX records point to an external mail provider. In such cases, you must configure the correct Email Routing settings and select Remote Mail Exchanger to ensure the server does not try to verify the email locally.
To change the remote mail exchanger in cPanel, please follow the instructions listed below:
- Log in to your “cPanel account”.
- From the “Search tool”, click on the “Email Routing”.
- Select the “Domain”.
- Tick the “Remote Mail Exchanger” radio button and after that click on “Change”.
That’s it, in this way email will now be sent from the remote mail exchange server on the third-party server configured for email routing.
For additional troubleshooting related to server access, see our guide on How to Check the Log of Failed RDP Login Attempts from the Windows Server