I want to be able to set a bcc for a specific mail template, so all mails using this template should be sent to the bcc address per default.

I recently purchased the email_cc_bcc module for Odoo 8, but haven't been able to use it with the email_template module. To be more precise: email_template introduces a cc-field itself, so I inherited email.template and extended it with a bcc-field. However, the cc and bcc values stored there are ignored by the module, as the fields in the mail.compose.message wizard stay empty.