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FYI, although it is not out yet, WordPress 5.5 will deprecate functionality that this plugin relies on. Ran into this while I was doing some testing work with this plugin on WordPress 5.5, with WP_DEBUG enabled.
Here is the content of the warning:
Deprecated: class-phpmailer.php is <strong>deprecated</strong> since version 5.5.0! Use wp-includes/PHPMailer/PHPMailer.php instead. The PHPMailer class has been moved to wp-includes/PHPMailer subdirectory and now uses the PHPMailer\PHPMailer namespace. in /var/www/html/wp-includes/functions.php on line 4924
Just an FYI.