import { default as dns, resolveMx } from 'dns';

export declare const dnsResolveMx: typeof resolveMx.__promisify__;
/**
 * MX check result
 */
export interface MxCheckResult {
    domain: string;
    hasMx: boolean;
    mxRecords?: dns.MxRecord[];
    error?: string;
}
/**
 * Options for MX checking
 */
export interface MxCheckOptions {
    /**
     * Timeout in milliseconds for DNS lookups
     * @default 5000
     */
    timeout?: number;
}
/**
 * Checks if a domain has MX records and returns the list of MX records
 * @param domain Domain to check
 * @param options Check options
 * @returns Promise resolving to MX check result
 */
export declare function checkMx(domain: string, options?: MxCheckOptions): Promise<MxCheckResult>;