export declare class InvalidMessageToRecipientError extends Error {
    constructor(message?: string);
}
export declare function throwInvalidMessageToRecipientError(message?: string): void;
export declare class InvalidMessageCcRecipientError extends Error {
    constructor(message?: string);
}
export declare function throwInvalidMessageCcRecipientError(message?: string): void;
export declare class InvalidMessageBccRecipientError extends Error {
    constructor(message?: string);
}
export declare function throwInvalidMessageBccRecipientError(message?: string): void;
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