This applies to 4.1.3. If SMTP settings are detected in config.php, pgvMail sends via PHPMailer. If not, it will default to PHP's mail function.
Configuration options are not yet added to editconfig.php. SMTP settings were added manually to config.php.
$PGV_SMTP['Host'] = 'localhost';
$PGV_SMTP['Helo'] = 'zuul.org';
$PGV_SMTP['Port'] = '25';
More configuration values (for SMTP Auth, etc.) can be found at http://phpmailer.codeworxtech.com/properties.html