email-deep-validator-ts

Verify email address checking MX records, and SMTP connection.

Installation

Install the module through NPM:

$ npm install email-deep-validator-ts --save

Requires Node 7.6 or above

Examples

Include the module, create a new EmailValidator object and call verify method:

const EmailValidator = require('email-deep-validator-ts');

const emailValidator = new EmailValidator();
const { wellFormed, validDomain, validMailbox } = await emailValidator.verify('[email protected]');
// wellFormed: true
// validDomain: true
// validMailbox: true

When a domain does not exist or has no MX records, the domain validation will fail, and the mailbox validation will return null because it could not be performed:

const { wellFormed, validDomain, validMailbox } = await emailValidator.verify('[email protected]');
// wellFormed: true
// validDomain: false
// validMailbox: null

A valid Yahoo domain will still return validMailbox true because their SMTP servers do not allow verifying if a mailbox exists.

Configuration options

timeout

Set a timeout in seconds for the smtp connection. Default: 10000.

verifyDomain

Enable or disable domain checking. This is done in two steps:

1. Verify that the domain does indeed exist;
2. Verify that the domain has valid MX records.

Default: true.

verifyMailbox

Enable or disable mailbox checking. Only a few SMTP servers allow this, and even then whether it works depends on your IP's reputation with those servers. This library performs a best effort validation:

• It returns null for Yahoo addresses, for failed connections, for unknown SMTP errors.
• It returns true for valid SMTP responses.
• It returns false for SMTP errors specific to the address's formatting or mailbox existance.

Default: true.

Testing

$ npm test

Changelog

2.0.0

• (BREAKING) Requires node 7.6 for async/await.
• (BREAKING) Instead of throwing on any invalidation, the lib now returns an object with which validations failed.
• (BREAKING) Configuration property verifyMxRecords renamed to verifyDomain.
• (BREAKING) Configuration property verifySmtpConnection renamed to verifyMailbox.