Public notifications plugin
This plugin allows you to define CC address(es) for notifications for public tickets. Public tickets are those for which anonymous users have the TICKET_VIEW permission. This is similar to smtp_always_cc configuration option.
[notification] ... smtp_public_always_cc = email@example.com ...
This is useful for when you want to send all ticket changes to the public mailing list, but some of those tickets are closed from the public because they are security issue or something (using for example SensitiveTicketsPlugin or ComponentPermissionsPlugin). Then you do not want that information about those tickets leaked to the mailing list. So instead of defining smtp_always_cc you define smtp_public_always_cc with this plugin.
Download the zipped source from here.
pip install PublicNotificationsPlugin
For more information, please follow documentation on how to install Trac's plugins.