Penyblack is a newsletter module based on the feincms.org CMS building toolkit. E-mails can either be sent as mass mails (e.g. monthly newsletter) or as part of a customised workflow (e.g. user clicks on a link and in response to that your application sends out an e-mail). Conditional data and variables can be filled in to a newsletter using the django template language. SPF (sender validation) and bounce management can be activated if desired. Key data like bounce rate, opening rate and link clicks is tracked and presented in the admin menu. Sending bulk e-mails is easy on memory. 20’000 and more addresses wont crash your server. From the outset we developed Pennyblack to easily integrate into existing web projects.