---
title: "Ember: Built with ProductOS | ProductOS"
description: "Ember connects a sender's own mailboxes over IMAP/SMTP and exchanges human-like warmup email across that fleet on a ramp schedule, opening, replying, marking im"
url: https://productos.dev/showcase/ember
---

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Web app Develop surface

Ember

# Land in the inbox, not in spam, email warmup that builds sender reputation on mailboxes you own

Ember connects a sender's own mailboxes over IMAP/SMTP and exchanges human-like warmup email across that fleet on a ramp schedule, opening, replying, marking important, and rescuing messages out of spam, so providers learn the sender is real before the first cold campaign. A launchable product end to end: a real warmup engine with AES-256-GCM-encrypted credentials and hard volume ceilings, honest placement reporting with a per-mailbox health score that is labeled an estimate, per-mailbox ramp controls, auth with required email verification, per-mailbox subscription billing, and a seeded public demo.

[View live ](https://ember-cq6t.vercel.app/)

Ember · Live project

## How it was built

- Deliverability product brief, ramp engine, placement reporting, guardrails, planned by the Coding Agent
- Quiet-precision DESIGN.md translated light-first: paper canvas, ink text, one ember accent
- Next.js app + Astro landing in one monorepo with a zero-env demo mode
- IMAP/SMTP warmup engine with encrypted credentials, jittered human-like cadence and spam rescue
- Auth, Polar per-mailbox billing, Neon and transactional email wired; deployed to Vercel

## Stack

Next.js 15 Astro Better Auth + Polar Neon Tailwind v4

## Built on

[ProductOS Develop surface ](https://develop.productos.dev/)

94

health score on the demo's warmed mailbox

14

spam rescues in the demo week

50/day

hard volume ceiling per mailbox

## Build something like Ember

Give the agents a brief. Get a deployed product. Every project in the showcase started as a single prompt.

[Start building](https://beta.productos.dev/sign-up?utm%5Fsource=productos.dev/showcase) [Back to Showcase](https://productos.dev/showcase)