@mailtester/coreEmail Validation Done Right

Modern, high-performance email validation for Node.js with RFC 5322 compliance, typo detection, and bulk processing.

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Blazing Fast

3x faster than alternatives. Single validation under 150ms, bulk 100 emails in under 5 seconds.

Comprehensive Validation

5 validators - Regex (RFC 5322), Typo Detection, Disposable Blocking, MX Records, and SMTP verification.

Lightweight

Only 25KB gzipped with minimal dependencies. No bloat, just what you need.

TypeScript First

Built with TypeScript 5.3+ strict mode. Full type safety and IntelliSense support.

Bulk Processing

Process thousands of emails concurrently with built-in rate limiting and progress tracking.

Zero Config

Works out of the box with sensible defaults. Customize when you need to with presets.

Quick Install

bash

npm install @mailtester/core

Quick Start

typescript

import { validateBulk } from '@mailtester/core';

const emails = [
  'user1@gmail.com',
  'user2@yahoo.com',
  'fake@mailinator.com'
];

const result = await validateBulk(emails, {
  concurrency: 10,
  onProgress: (completed, total) => {
    console.log(`Progress: ${completed}/${total}`);
  }
});

console.log(`Valid: ${result.valid}/${result.total}`);
// Output: "Valid: 2/3"

Why mailtester?

Feature	@mailtester/core	deep-email-validator
Performance	3x faster	Slower
Bundle Size	25KB	50KB+
TypeScript	Native	Basic
Bulk Validation	Built-in	No
Rate Limiting	Built-in	No
Maintained	Active	Limited