SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting - Using WHMCS - WHMCS.Community
Mailer Error: Language string failed to load: tls - PHP - SitePoint Forums | Web Development & Design Community
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How to Solve SMTP: Could Not Authenticate using Gmail + PHPMailer? | Algorithms, Blockchain and Cloud
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