> For the complete documentation index, see [llms.txt](https://docs.chamilo.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chamilo.org/1.11.x/admin-guide/appendix/frequently_asked_questions.md).

# Frequently asked questions

- [Sending e-mails from the platform doesn't work](https://docs.chamilo.org/1.11.x/admin-guide/appendix/frequently_asked_questions/sending_e-mails_from_the_platform_doesnt_work.md)
- [How do I prevent teachers to subscribe or unsubscribe learners into/from their courses?](https://docs.chamilo.org/1.11.x/admin-guide/appendix/frequently_asked_questions/how_do_i_prevent_teachers_to_subscribe_or_unsubscr.md)
- [How do I block access to the course catalog for learners?](https://docs.chamilo.org/1.11.x/admin-guide/appendix/frequently_asked_questions/how_do_i_block_access_to_the_course_catalog_for_le.md)
- [How much bandwidth does the videoconference tool (admin/BigBlueButton) consume?](https://docs.chamilo.org/1.11.x/admin-guide/appendix/frequently_asked_questions/how-much-bandwidth-does-the-videoconference-tool-admin-bigbluebutton-consume.md)