Check whether an email address exists.

This module checks whether an email address exists by connecting to the mail server and pretending to send an email (but not actually sending it, of course).

For checking whether an email is syntactically valid, please use hapijs/isemail.

npm install email-exists

const emailExists = require('email-exists')

emailExists({ sender: '[email protected]',
              recipient: '[email protected]' })
    .then(console.log)
    // --> MAY_EXIST

• requires an options <Object> with the following properties:
  • sender <String>: required; the sender's email address for the MAIL FROM command
  • recipient <String>: required; the recipient's email address for the RCPT TO command
  • timeout <Number>: default = 3000; the timeout in milliseconds for the Telnet connection
  • debug <Boolean>: default = false; whether to print debug messages to the console
• returns a <Promise> which:
  • resolves with one of the following <String> objects:
    • INVALID_SYNTAX: Represents a 553 indicating that the mailbox name is not allowed due to invalid syntax
    • NOT_FOUND: Represents a 550 indicating that the mailbox is unavailable, cannot be found, or may not be accessed
    • MAY_EXIST: To prevent clients from discovering all available addresses, servers may respond with false positives; therefore, this result is deliberately named "may exist", indicating that it is highly likely that the address actually exists, but that it cannot be confirmed (without actually sending a confirmation mail)
  • rejects with an <Error> object if either the DNS lookup or the Telnet connection fails

• Mark Tiedemann
• Andrew Lomakin

MIT