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Broken email sending with attachment due to malfucntioning base64 validation (catastrophic ...

if (!is_null($content) && (!preg_match("/^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$/", $content))) { Pattern /^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za ...