# deep-email-validator

Validates email addresses based on regex, common typos, disposable email blacklists, DNS records and SMTP server response.

- Validates email format (contains `@`, `.` in domain, no spaces or control characters).
- Validates common typos e.g. `example@gmaill.com` using [mailcheck](https://github.com/mailcheck/mailcheck).
- Validates email was not generated by a disposable email service using [disposable-email-domains](https://github.com/ivolo/disposable-email-domains).
- Validates MX records are present on DNS.
- Validates SMTP server is running.
- Validates mailbox exists on SMTP server.
- Sanitizes inputs to prevent SMTP command injection.
- Native TypeScript support.

## Getting Started

Requires Node.js >= 20. Server-side only (not browser compatible).

### Installation

```
npm install deep-email-validator
```

### Usage

```typescript
import { validate } from 'deep-email-validator'

const res = await validate('asdf@gmail.com')
// {
//   "valid": false,
//   "reason": "smtp",
//   "validators": {
//       "regex": {
//         "valid": true
//       },
//       "typo": {
//         "valid": true
//       },
//       "disposable": {
//         "valid": true
//       },
//       "mx": {
//         "valid": true
//       },
//       "smtp": {
//         "valid": false,
//         "reason": "Mailbox not found.",
//       }
//   }
// }
```

You can also pass an options object to control which validations run:

```typescript
await validate({
  email: 'name@example.org',
  sender: 'name@example.org',
  validateRegex: true,
  validateMx: true,
  validateTypo: true,
  validateDisposable: true,
  validateSMTP: true,
})
```

[Default options can be found here.](https://github.com/mfbx9da4/deep-email-validator/blob/main/src/options/options.ts#L1)

### Custom TLDs

If you want to validate domains with TLDs that are not supported by default, use the `additionalTopLevelDomains` option:

```typescript
await validate({
  email: 'name@example.ir',
  additionalTopLevelDomains: ['ir'],
})
```

For a list of TLDs supported by default, see [mailcheck defaults](https://github.com/mailcheck/mailcheck/blob/afca031b4ce1cdc6e3ecbe88198f41b4835f81e3/src/mailcheck.js#L31).

<details>
<summary>CommonJS usage</summary>

```javascript
const { validate } = require('deep-email-validator')

const res = await validate('asdf@gmail.com')
```

</details>