If you look in the Umbraco source on GitHub, you can see that the GlobalSettings class has a property Smtp. You can read the settings from that object.

In surface controllers you can use dependency injection, so you can simply add a constructor and pass the global settings in there like this:

public class MyController : SurfaceController
{
    public MyController(IOptions<GlobalSettings> globalSettings)
    { ... }
}

Kind regards,
Dennis

Just a bit more information about the answer that was mentioned, as it helped me a lot. The Umbraco documentation can be found here. Configuration

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