In business, a "no" now might be a "yes" later. Sometimes, it's not the right timing, they're already locked in to an existing business or service, or there's something else preventing them from taking action. The SendFox team would send this email 40 days after the initial sequence to gauge interest in if it's the right time. Don't hesitate to follow-up later in your own sequences. It's easy, and it can lead to great results.