export declare function validateToRecipients(values: any): void;
export declare function validateToRecipient(value: any): void;
export declare function areValidToRecipients(values: any): values is string[];
export declare function isValidToRecipient(value: any): value is string;
export declare function validateCcRecipients(values: any): void;
export declare function validateCcRecipient(value: any): void;
export declare function areValidCcRecipients(values: any): values is string[];
export declare function isValidCcRecipient(value: any): value is string;
export declare function validateBccRecipients(values: any): void;
export declare function validateBccRecipient(value: any): void;
export declare function areValidBccRecipients(values: any): values is string[];
export declare function isValidBccRecipient(value: any): value is string;
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