     public let postURL: URL?
     
     /// A `Bool` indicating if the setting is enabled or not.
-    public var enable: Bool { return self.threshold != nil }
+    public let enable: Bool
     
     
     // MARK: - Initialization


/// The `SpamChecker` mail setting allows you to test the content of your email
/// for spam.
public struct SpamChecker {
    
    // MARK: - Properties
    //=========================================================================

    public init() {
        self.threshold = nil
        self.postURL = nil
        self.enable = false
    }
    
}

/// Encodable conformance.
public extension SpamChecker {
    
    public enum CodingKeys: String, CodingKey {
        case enable
        case threshold
        case postURL = "post_to_url"
    }
    
}
