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DisposableMail serves you a blacklist with domains from disposable mail services, like mailinator.com or guerrillamail.com. The list can be used to prevent sending mails to these domains (which probably won't be open), or to prevent dummy users registration in your website.

The domain list comes from this git repo: https://github.com/martenson/disposable-email-domains

And this gem syncs with it through a git submodule (see the data folder).

Add this line to your application's Gemfile:

gem 'disposable_mail', '~> 0.1'

And then execute:

$ bundle

require 'disposable_mail'
DisposableMail.list # => ["0815.ru", "0815.su", "0clickemail.com", "0-mail.com", "0wnd.net", "0wnd.org", "10minut.com.pl", ... ]
DisposableMail.include? "dummy@mailinator.com" # => true
DisposableMail.include? "bot@guerillamail.com" # => true
DisposableMail.include? "legit-person@yahoo.com" # => false

If you include this gem in your rails project you can use a custom validator to block dummy users registration.

Suposse you don't want to create Users with a blacklisted mail domain, and your mail attribute is called email:

class User < ActiveRecord::Base
 # validates :email, undisposable: true
 validates :email, undisposable: { message: 'Sorry, but we do not accept your mail provider.' }
end

Now if you try to create an user with a mail from the blacklisted domains, you get an AR validation error:

user = User.create(email: "bot@mailinator.com")
user.errors.messages # => {:email=>["Sorry, but we do not accept your mail provider."]}

What if you want to create those users only in the test environment?

class User < ActiveRecord::Base
 validates :email, undisposable: true, unless: -> { Rails.env.test? }
end

If you don't specify the message in the model validation, Active Record will look for messages in this order:

activerecord.errors.models.user.attributes.email.undisposable
activerecord.errors.models.user.undisposable
activerecord.errors.messages.undisposable
errors.attributes.email.undisposable
errors.messages.undisposable

Here's an example of an en.yml file:

en:
 errors:
 attributes:
 email:
 undisposable: "domain is blocked"

You can use the aforementioned order of lookup to craft specific error messages.

This gem comes with default messages for the following locales:

• en
• pt-BR

1. Fork it ( https://github.com/oesgalha/disposable_mail/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request