/**
 * SMTP Client Error Handler
 * Error classification and recovery strategies
 */
import { SmtpErrorType } from './constants.js';
import type { ISmtpResponse, ISmtpErrorContext, ISmtpClientOptions } from './interfaces.js';
export declare class SmtpErrorHandler {
    private options;
    constructor(options: ISmtpClientOptions);
    /**
     * Classify error type based on response or error
     */
    classifyError(error: Error | ISmtpResponse, context?: ISmtpErrorContext): SmtpErrorType;
    /**
     * Determine if error is retryable
     */
    isRetryable(errorType: SmtpErrorType, response?: ISmtpResponse): boolean;
    /**
     * Get retry delay for error type
     */
    getRetryDelay(attempt: number, errorType: SmtpErrorType): number;
    /**
     * Create enhanced error with context
     */
    createError(message: string, errorType: SmtpErrorType, context?: ISmtpErrorContext, originalError?: Error): Error;
    private classifyErrorByMessage;
    private classifyErrorByCode;
}