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We are aware of an issue after updating to cPanel versions 11.110.0.65, 11.126.0.21, or 11.128.0.11, some cPanel plugins or features are no longer functioning properly including WP Toolkit. Please see the following article for more information and updates:
Update to latest cPanel 110, 126, or 128 versions removes "addonfeatures" directory.

"SMTP AUTH is required for message submission on port 587" error when trying to send mail

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