From one side, great work! From another side, this looks much more complex, that getting an email service with catch-all address and use rules/filters to do th

From one side, great work! From another side, this looks much more complex, that getting an email service with catch-all address and use rules/filters to do the same. I'd programmatically manage rules/filters and folders, rather than this entire system. All email providers I have used on scale (Google, Microsoft, Rackspace) support this. I'd still have a usual email service with SMTP and IMAP, rather than incompatible custom JSON APIs and unknown failure modes. What is really interesting is cost on scale. Because if it is cheaper to send/receive 100M emails though this, than it's worth trying. However this is exactly the part not covered at all. And if you are sending not a lot of emails, maybe pay $50 to major email provider and spend your time on something more important?