В файле config_inc.php
$g_allow_signup = ON; //allows the users to sign up for a new account
$g_enable_email_notification = ON; //enables the email messages
$g_phpMailer_method = PHPMAILER_METHOD_SMTP;
$g_smtp_host = 'smtp.mail.ru';
$g_smtp_connection_mode = 'tls';
$g_smtp_port = 587;
$g_smtp_username = 'user@mail.ru'; //replace it with your gmail address
$g_smtp_password = '*******'; //replace it with your gmail password
$g_administrator_email = 'admin@mail.ru'; //this will be your administrator email address