The partners cc and bcc from company form will be used to fill in mail composer
form.

  .. image:: ../static/img/mail_compose_message_default_cc_bcc.png

When select a template that has cc and/or bcc emails, the emails will be used
to lookup partners then found partners will be added to corresponding mail
composer's fields.

  .. image:: ../static/img/mail_compose_message_template_cc_bcc.png