class Rails::Conductor::ActionMailbox::InboundEmailsController

def new_mail
  Mail.new(params.require(:mail).permit(:from, :to, :cc, :bcc, :in_reply_to, :subject, :body).to_h).tap do |mail|
    params[:mail][:attachments].to_a.each do |attachment|
      mail.add_file(filename: attachment.path, content: attachment.read)
    end
  end
end