mail_provider (rubygems):   Smartly check whether a given email/domain belongs to a free or disposable   mail provider. There are hundreds of lists available in Github repositories   or Gists that list various free and disposable email providers. This gem   downloads a bunch of these scripts (pre-configured URLs) and parses them to   count votes against each domain in the list. We, then, create a Trie   structure to efficiently query this data with a given domain or email. For   each query, you get back a number specifying how many sources are claiming   that the domain is a free or disposable email provider. 
Keywords: disposable-check|disposable-domains|disposable-emails|mail-provider