def init_app(self, app):
"""Initializes your mail settings from the application settings.
You can use this if you want to set up your Mail instance
at configuration time.
:param app: Flask application instance
"""
state = self.init_mail(app.config, app.debug, app.testing)
# register extension with app
app.extensions = getattr(app, 'extensions', {})
app.extensions['mail'] = state
return state
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