This document describes the process in which external applications can authenticate a YouMail user against YouMail services.
YouMail currently provides a single mechanism for authenticating. This mechanism requires that the user provide their credentials to the client application, which in turn uses that information to authenticate against a YouMail service. The YouMail service will return an authentication key to be used by the client application in future requests.
It should be noted that all exchanges through the YouMail APIs should be used in conjunction with a transport-layer security mechanism to protect sensitive data from malicious eavesdropping. All YouMail APIs can all be accessed using HTTPS.