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‘550 Relay Not Permitted’ cpanel


550 Relay Not Permitted – How to fix it in Exim, cPanel, Outlook, Thunderbird and Outlook Express

550 Relay Not Permitted – How to fix it in Exim, cPanel, Outlook, Thunderbird and Outlook Express

‘550 Relay Not Permitted’ is a common error message in email programs when users attempt to send mails without proper authentication. This is a security measure to protect mail server from open relay.

In our role as Dedicated Support Specialists for web hosting companies, we see this error often reported by website owners.

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