Cloud Stack for AI Apps — Mastery5 / 8
Resend — Transactional Email That Lands
The receipt, the download link, the password reset — if they hit spam, your product feels broken. Deliverability is a feature.
Transactional email is the part of your product users see outside your product. A receipt or download link in the spam folder makes a working product feel broken. Resend makes the API part trivial; deliverability is the part you must respect.
Deliverability is configuration
Send from your own domain (noreply@yourapp.com), not a free address. Warm up volume gradually.
Email that renders everywhere
Email clients are a decade behind browsers: use tables for layout and inline styles, web-safe fonts, and a hosted image for your logo. Always include a plain-text alternative. Test in Gmail, Outlook, and Apple Mail — they disagree.
Tie sends to your webhooks
The purchase email should fire from the Stripe webhook (the source of truth), not the client. Make sends idempotent — Stripe can deliver a webhook twice, and your customer should not get two receipts.
App, data, payments, email — the managed path is now complete. Next: when and how to drop down to AWS.
Series — Cloud Stack for AI Apps — Mastery
- Part 01The Opinionated AI Product StackChoosing infrastructure is where weeks vanish. Here is a default stack that lets a small team ship an AI product in days — and when to deviate.
- Part 02Next.js on Vercel — The App LayerOne framework for UI, API and server rendering; one platform that deploys on git push. The app layer should be the part you never think about.
- Part 03Supabase — Postgres, Auth & Storage in OneReal Postgres, auth, file storage and pgvector behind one SDK. For an AI product, having your data and your vectors in the same database is a quiet superpower.
- Part 04Stripe — Payments & SubscriptionsCharging money is a solved problem — if you let Stripe solve it. Checkout, subscriptions, and the webhook that is the real source of truth.
- Part 05Resend — Transactional Email That Lands — you are hereThe receipt, the download link, the password reset — if they hit spam, your product feels broken. Deliverability is a feature.
- Part 06AWS — When You Outgrow the Managed PathThe managed stack covers 90% of an AI product. AWS is the escape hatch for the other 10% — long jobs, GPU inference, large files. Use it surgically.
- Part 07Secrets, Env & Config Across EnvironmentsFive services, three environments, one leaked key away from a bad week. Config discipline is unglamorous and non-negotiable.
- Part 08Shipping in Days — The Wiring PlaybookThe whole stack assembled into a build order: from empty repo to a paid, emailing, AI-powered product in a working week.