/**
 * Hook for interacting with external space inboxes
 * Provides limited capabilities for sending messages to other spaces' inboxes
 */
export declare function useExternalSpaceInbox({ spaceId, inboxId }: {
    spaceId: string;
    inboxId: string;
}): {
    loading: boolean;
    error: Error | null;
    sendMessage: (message: string) => Promise<void>;
    inboxId: string;
    isPublic: boolean;
    authPolicy: string;
    encryptionPublicKey: string;
};
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