export declare class FormatValidator {
    private static readonly RFC5322_REGEX;
    private static readonly STRICT_REGEX;
    static validate(email: string, strict?: boolean): {
        isValid: boolean;
        error?: string;
    };
    static validateBatch(emails: string[], strict?: boolean): Array<{
        email: string;
        isValid: boolean;
        error?: string;
    }>;
}
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