She can't reply to all because Badger will see it, so she has to manually edit the recipient list on the private email and create yet another copy of the message.

When an attached file is large and a message containing it is broadcast to thousands of users, creating a separate copy of the message for each recipient could require several gigabytes of disk space.

You must provide a copy of the GPL with the program, so that the recipient is aware of his rights under the license.