lib/createsend/client.rb
def suppress(emails)
      options = { :body => {
        :EmailAddresses => emails.kind_of?(String) ?
          [ emails ] : emails }.to_json }
      post "suppress", options
    end
def suppress(emails)
      options = { :body => {
        :EmailAddresses => emails.kind_of?(String) ?
          [ emails ] : emails }.to_json }
      post "suppress", options
    end
Adds email addresses to a client's suppression list