ALTER TABLE `$table_settings` ADD `smtpServer` varchar(60) NOT NULL default 'www.yourdomain.ext';
ALTER TABLE `$table_settings` ADD `smtpport` int(4) NOT NULL default '25';
ALTER TABLE `$table_settings` ADD `smtptimeout` int(3) NOT NULL default '30';
ALTER TABLE `$table_settings` ADD `smtpusername` varchar(32) NOT NULL default 'username';
ALTER TABLE `$table_settings` ADD `smtppassword` varchar(32) NOT NULL default 'password';
ALTER TABLE `$table_settings` ADD `smtphost` varchar(60) NOT NULL default 'localhost';
ALTER TABLE `$table_settings` ADD `smtp_status` set('on','off') NOT NULL default 'on';