/**
 * Error types module stub
 */

export class SmtpError extends Error {
  constructor(message: string, public code?: number) {
    super(message);
    this.name = 'SmtpError';
  }
}

export class AuthenticationError extends Error {
  constructor(message: string) {
    super(message);
    this.name = 'AuthenticationError';
  }
}

export class RateLimitError extends Error {
  constructor(message: string) {
    super(message);
    this.name = 'RateLimitError';
  }
}