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Posty is an open source administration tool for mail servers compatible with Postfix and Dovecot. Developed in 2013, the RESTful Posty API is the core component of the Posty software stack, and can be used in outside applications or with the Posty client. Using HTTP calls, the Posty API can be used to retrieve, edit, and delete domain names, user information, aliases, summaries, transports, and more. The API is under LGPL v3 license. All Posty software is open source on GitHub.