1. Mailinabox
Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
2. Free tls certificates
A simple Python 2/Python 3 client library for Let's Encrypt, or any ACME server that issues TLS (aka SSL) certificates.
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python1-3 of 3 user projects