/**
 * Usage
 * var { isEmailValid } = require('email-validator-node')
 * await isEmailValid(String email);
 *
 * @param {String} email - The possible email input
 * @return {validateEmailResponse} true is the specified email is valid, false otherwise
 */
declare function checkEmail(email: string): Promise<validateEmailResponse>;
/**
 * Usage
 * var { isEmailFormatValid } = require('email-validator-node')
 * await isEmailFormatValid(String email);
 *
 * @param {String} email - The possible email input
 * @return {Boolean}
 */
declare function isEmailFormatValid(email: string): boolean;
/**
 * Usage
 * var { isBlacklisted } = require('email-validator-node')
 * await isBlacklisted(String email);
 *
 * @param {String} email - The possible email input
 * @return {Boolean}
 */
declare function isBlacklisted(email: string): boolean;
/**
 * MX Record interface
 */
export interface MxRecord {
    priority: number;
    exchange: string;
}
/**
 * Validation check results interface
 */
export interface ValidationChecks {
    format: boolean;
    blacklist: boolean;
    dns: boolean;
}
/**
 * Email validation result interface
 */
export interface ValidationResult {
    isValid: boolean;
    email?: string;
    checks?: ValidationChecks;
    mxRecords?: MxRecord[];
    message?: string;
}
/**
 * Validation options interface
 */
export interface ValidationOptions {
    skipBlacklist?: boolean;
    skipDNS?: boolean;
    timeout?: number;
    cache?: boolean;
}
type validateEmailResponse = ValidationResult;
/**
 * Usage
 * var { isMXRecordValid } = require('email-validator-node')
 * await isMXRecordValid(String email);
 *
 * @param {String} email - The possible email input
 * @return {validateEmailResponse} true is the specified email is valid, false otherwise
 */
declare function isMXRecordValid(email: string, timeout?: number): Promise<ValidationResult>;
/**
 * Batch email validation with parallel processing
 * @param emails Array of email addresses to validate
 * @param concurrency Maximum concurrent DNS queries (default: 5)
 * @returns Promise<ValidationResult[]>
 */
declare function checkEmails(emails: string[], concurrency?: number): Promise<ValidationResult[]>;
export { checkEmail, checkEmails, isEmailFormatValid, isMXRecordValid, isBlacklisted, };