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An Error occurred SMTP Error: could not authenticate.

Posted on: November 19, 2014

You may see the error  “An Error occurred SMTP Error: could not authenticate” in your whmcs while sending a mail or an invoice. The issue could be caused by both firewall on the server and the settings at your WHMCS. Please follow the steps to resolve the issue. 1) Login to the server via SSH. 2) […]

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