Valid Email

Purpose

It validates email for application use (registering a new account for example).

Usage

In your Gemfile:

gem 'valid_email'

In your code:

require 'valid_email'

class Person
  include ActiveModel::Validations
  attr_accessor :name, :email

  validates :name, presence: true, length: { maximum: 100 }
  validates :email, presence: true, email: true
end


person = Person.new
person.name = 'hallelujah'
person.email = 'john@doe.com'
person.valid? # => true

person.email = 'john@doe'
person.valid? # => false

person.email = 'John Does <john@doe.com>'
person.valid? # => false

You can check if email domain has MX record:

validates :email,
          email: {
            mx: true,
            message: I18n.t('validations.errors.models.user.invalid_email')
          }

Or

validates :email,
          email: {
            message: I18n.t('validations.errors.models.user.invalid_email')
          },
          mx: {
            message: I18n.t('validations.errors.models.user.invalid_mx')
          }

By default, the email domain is validated using a regular expression, which does not require an external service and improves performance. Alternatively, you can check if an email domain has a MX or A record by using :mx_with_fallback instead of :mx.

validates :email, email: { mx_with_fallback: true }

You can detect disposable accounts

validates :email,
          email: {
            ban_disposable_email: true,
            message: I18n.t('validations.errors.models.user.invalid_email')
          }

If you don't want the MX validator stuff, just require the right file

require 'valid_email/email_validator'

Or in your Gemfile

gem 'valid_email', require: 'valid_email/email_validator'

Usage outside of model validation

There is a chance that you want to use e-mail validator outside of model validation. If that's the case, you can use the following methods:

options = {} # You can optionally pass a hash of options, same as validator
ValidateEmail.valid?('email@randommail.com', options)
ValidateEmail.mx_valid?('email@randommail.com')
ValidateEmail.mx_valid_with_fallback?('email@randommail.com')
ValidateEmail.valid?('email@randommail.com')

Load it (and not the Rails extensions) with

gem 'valid_email', require: 'valid_email/validate_email'

String and Nil object extensions

There is also a String and Nil class extension, if you require the gem in this way in Gemfile:

gem 'valid_email', require: 'valid_email/all_with_extensions'

You will be able to use the following methods:

nil.email? # => false
'john@gmail.com'.email? # => May return true if it exists.
# It accepts a hash of options like ValidateEmail.valid?

Code Status

Credits

• Ramihajamalala Hery hery[at]rails-royce.org
• Fire-Dragon-DoL francesco.belladonna[at]gmail.com
• dush dusanek[at]iquest.cz
• MIke Carter mike[at]mcarter.me
• Heng heng[at]reamaze.com
• Marco Perrando mperrando[at]soluzioninrete.it
• Jörg Thalheim joerg[at]higgsboson.tk
• Andrey Deryabin deriabin[at]gmail.com
• Nicholas Rutherford nick.rutherford[at]gmail.com
• Oleg Shur workshur[at]gmail.com
• Joel Chippindale joel[at]joelchippindale.com
• Sami Haahtinen sami[at]haahtinen.name
• Jean Boussier jean.boussier[at]gmail.com
• Masaki Hara - @qnighy

Pull Requests

1. Fork the project.
2. Make your feature addition or bug fix.
3. Add tests for it. This is important so I don’t break it in a future version unintentionally.
4. Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
5. Send me a pull request. Bonus points for topic branches.

Copyright

Copyright © 2011 Ramihajamalala Hery. See LICENSE for details