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Online MTA-STS testing tool

This tool verifies whether a give host correctly implements the new in-development MTA-STS standard for downgrade-resistant secure email. It is very new and not very well tested so don't rely on it's result too much.

Online version: https://aykevl.nl/apps/mta-sts/

License: BSD 2-clause license (see LICENSE.txt).

Installing on Debian

This guide has been written for Debian buster. It will work on stretch with minimal modifications (replace python3-flask-limiter with the pip3 package Flask-Limiter).

  1. Install dependencies:

    $ apt-get install uwsgi uwsgi-plugin-python3 python3-flask python3-flask-limiter python3-dnspython
    
  2. Create a configuration file for uWSGI (howto) at /etc/uwsgi/emperor.ini:

    [uwsgi]
    emperor = /etc/uwsgi/vassals
    uid = www-data
    gid = www-data
    limit-as = 1024
    logto = /tmp/uwsgi.log
  3. Create a configuration for this app at /etc/uwsgi/vassals/mta-sts.ini (create /etc/uwsgi/vassals first):

    [uwsgi]
    socket             = /tmp/mta-sts.sock
    manage-script-name = true
    mount              = /=check:app
    plugins            = python3
    chmod-socket       = 666
    pythonpath         = /some/path/mta-sts
  4. Enable and start uWSGI (check /tmp/uwsgi.log for errors):

    $ sytemctl enable emperor.uwsgi.service
    $ sytemctl start emperor.uwsgi.service
    
  5. Make sure a webserver redirects requests to /tmp/mta-sts.sock. For example, with nginx:

    location = /apps/mta-sts/api {
        include uwsgi_params;
        uwsgi_pass unix:/tmp/mta-sts.sock;
    }
  6. Test the app with a browser.

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