That's is my personal fork from the Derek Allard's BambooInvoice, that it not under maintenance. So that I maintain my fork for usage.
BambooInvoice is free Open Source invoicing software intended for small businesses and independent contractors. Built on CodeIgniter, its priorities are ease of use and user-interface.
See the PDF file inside the directory documentation for details.
$config['smtp_user'] = 'you@gmail.com';
$config['smtp_pass'] = 'yourpassword';
$config['smtp_host'] = 'ssl://smtp.gmail.com';
$config['protocol'] = 'smtp';
$config['smtp_port'] = '465';
$config['newline'] = "\r\n"; // This is what makes it work with GMAIL