My version of Miguel Grinberg's excellent flask tutorial.
start elastic search
C:\elasticsearch-7.4.2\bin\elasticsearch.bat
In the command line type:
flask run
$env:MS_TRANSLATOR_KEY = "lkj..."
in separate shell (Debug mode must be off)
python -m smtpd -n -c DebuggingServer localhost:8025
samuel, pw: dog susan, pw: cat