https://docs.whmcs.com/9-1/tags/php-mail/Recent content in php-mail onHugo -- gohugo.iohttps://docs.whmcs.com/9-1/troubleshooting/troubleshoot-email/php-mail/could-not-instantiate-errors/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-email/php-mail/could-not-instantiate-errors/Explains that the “Could not instantiate mail function” error occurs when PHP Mail is the selected Mail Provider and the mail server rejects the send attempt, with the fix of switching Mail Provider in General Settings > Mail, or on self-hosted installs, installing Postfix and checking the sendmail_path in php.ini.https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-email/php-mail/undefined-phpmailer-function-errors/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-email/php-mail/undefined-phpmailer-function-errors/Covers the “Call to undefined function PHPMailer\PHPMailer\escapeshellarg()” Oops error and the related Required PHP Extensions attention item on System Health, caused by the escapeshellarg function being disabled in the server’s PHP configuration, with the fix of adding the missing PHP extensions and recompiling PHP.