[MM3-users] Mailman 3 installation, no mails in hyperkitty, unable to add footer.

I have read documentation, but still have stupid questions, could You please help, because I can't make it working. I do not understand something important. I have no experience with python at all. I have mailman 3, python 3.5 in my debian OS system, and additional packages like uwsgi and ect. using https://buildmedia.readthedocs.org/media/pdf/gnu-mailman/latest/gnu-mailman.... about till chapter 6. I understand mailman suite has hyperkitty already. But I am not sure about:

1. Does mailman-suite have hyper-kitty inside? Because if I run $python manage.py runserver - it runs. In installed it under dedicated OS user home and fonfigured to run. I can create lists, event add lists to hyperkitty page using: $django-admin runjob new_lists_from_mailman list server sends messages to list members as well. But nothing happens more. No emails come to hyperkitty, arciver log 0 size.
   $ python manage.py runjobs -l shows the lists of the jobs, so seems nothing to add.

Except uwsgi.ini, I have only 2 configuration files in mailman-suite project directory: settings.py and mailman.cfg So I do not understand what did I configured badly.

2. If I (using Postorius web interface) add footer template to my list under regular message, something strange happens. Mailman stops to send messages for list members. No any entries in the logs. Just Mailman log writes: "unable to connect localhost port 25" and no more explanation. If I delete list's footer template (web interface), mailman starts working again. What is bad here? How to add custom footer? In mailman 2 if was working so good and was easy to setup.