import * as plugins from '../../plugins.js';
import { Email } from '../core/classes.email.js';
import type { UnifiedEmailServer } from '../routing/classes.unified.email.server.js';
export interface IEmailSendOptions {
    maxRetries?: number;
    retryDelay?: number;
    connectionTimeout?: number;
    tlsOptions?: plugins.tls.ConnectionOptions;
    debugMode?: boolean;
}
export declare enum DeliveryStatus {
    PENDING = "pending",
    SENDING = "sending",
    DELIVERED = "delivered",
    FAILED = "failed",
    DEFERRED = "deferred"
}
export interface DeliveryInfo {
    status: DeliveryStatus;
    attempts: number;
    error?: Error;
    lastAttempt?: Date;
    nextAttempt?: Date;
    mxServer?: string;
    deliveryTime?: Date;
    logs: string[];
}
export declare class EmailSendJob {
    emailServerRef: UnifiedEmailServer;
    private email;
    private mxServers;
    private currentMxIndex;
    private options;
    deliveryInfo: DeliveryInfo;
    constructor(emailServerRef: UnifiedEmailServer, emailArg: Email, options?: IEmailSendOptions);
    /**
     * Send the email to its recipients
     */
    send(): Promise<DeliveryStatus>;
    /**
     * Validate the email before sending
     */
    private validateEmail;
    /**
     * Resolve MX records for the recipient domain
     */
    private resolveMxRecords;
    /**
     * Attempt to deliver the email with retries
     */
    private attemptDelivery;
    /**
     * Connect to a specific MX server and send the email using SmtpClient
     */
    private connectAndSend;
    /**
     * Record delivery event for monitoring
     */
    private recordDeliveryEvent;
    /**
     * Check if an error represents a permanent failure
     */
    private isPermanentFailure;
    /**
     * Resolve MX records for a domain
     */
    private resolveMx;
    /**
     * Log a message with timestamp
     */
    private log;
    /**
     * Save successful email to storage
     */
    private saveSuccess;
    /**
     * Save failed email to storage
     */
    private saveFailed;
    /**
     * Delay for specified milliseconds
     */
    private delay;
}