1@kali:~/Apps/h8mail$ pip3 install h8mail
Requirement already satisfied: h8mail in /home/fly/.local/lib/python3.8/site-packages (2.5.4)
Requirement already satisfied: requests in /usr/lib/python3/dist-packages (from h8mail) (2.23.0)
1@kali:~/Apps/h8mail$ h8mail
bash: h8mail: command not found
1@kali:~/Apps/h8mail$ h8mail -h
bash: h8mail: command not found
1@kali:~/Apps/h8mail$ pip3 h8mail
ERROR: unknown command "h8mail"
1@kali:~/Apps/h8mail$ python3 h8mail
Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "h8mail/__main__.py", line 2, in <module>
    from .utils.run import main
ImportError: attempted relative import with no known parent package
1@kali:~/Apps/h8mail$