Electronic Document Service Needed - California US Resident Preferred

I need an electronic service to manage the emailing of documents. The service should include: - Email Proof of Service: Sending documents via email. - Proof of Delivery: Ensuring documents are delivered. - Delivery Confirmation Email: Providing an email as proof of delivery. Ideal skills and experience: - Experience with electronic document services - Reliable and timely email handling - Ability to generate and manage delivery confirmation emails