# Diversified Stack

> What the Diversified Stack is, why mixing Outlook, SMTP and Google inboxes protects your sending, and what each tier includes.

Source: https://docs.maildeck.co/plans/diversified-stack/

The **Diversified Stack** is our recommended plan: one monthly bundle that mixes
Premium Outlook tenants,
SMTP inboxes and
Google Workspace accounts, all set up and connected for you. It comes in
three sizes: Starter, Growth and Enterprise.

## Why diversify

Putting all your sending on one email provider is a single point of failure. If that provider tightens its rules or
your domains on it run into trouble, everything stops at once. Spreading your inboxes across three providers spreads
that risk: if one has a bad week, the others keep sending.

Each inbox type also has its own strengths, so a mix lets each one do what it's best at:

- **Outlook** gives you the most inboxes per domain, so it carries most of your volume.
- **Google Workspace** is the most widely trusted, so it's ideal for your most valuable prospects.
- **SMTP** is the cheapest per inbox, so it adds extra capacity at low cost.

[Inbox types](https://docs.maildeck.co/plans/inbox-types/) compares them in detail.

## The three tiers

| | **Starter** | **Growth** (most popular) | **Enterprise** |
|---|---|---|---|
| **Price** | $99/mo | $399/mo | $3,499/mo |
| **Sends per month** | 40K | 215K | 2.15M |
| **Premium Outlook tenants** | 2 (2 domains) | 10 (10 domains) | 100 (100 domains) |
| **SMTP inboxes** | 10 (2 domains) | 100 (20 domains) | 1,000 (200 domains) |
| **Google accounts** | 5 (1 domain) | 30 (6 domains) | 300 (60 domains) |
| **Domains you need** | 5 | 36 | 360 |
| **DNS and authentication setup** | Included | Included | Included |
| **Support** | Private Slack support | Dedicated Slack support | Dedicated account manager |

One Outlook tenant is one domain with up to 100 mailboxes. Google and SMTP have 5 inboxes per domain. That's why the
domain counts add up the way they do.

> **Tip: Buy the exact number of domains**
> Quick Start asks for exactly the number of domains your tier needs (5 for Starter, 36 for Growth, 360 for Enterprise)
> and assigns them to Outlook, SMTP and Google for you. Buy them at your registrar before you start. See
> [Domains](https://docs.maildeck.co/domains-dns/domains/).

## Which tier fits

Pick by how many emails you'll send a month:

- **Up to 40,000:** Starter.
- **Up to 215,000:** Growth.
- **More than 215,000 but under 1 million:** Growth, with a custom stack on top sized by our team.
- **1 million or more:** Enterprise.

Not sure how many emails you need? [Choosing a plan](https://docs.maildeck.co/plans/choosing-a-plan/) works it out from the number of calls
you want, or ask Maya in the app.

> **Note: Sends per month is capacity, not a target**
> The sends figure is how much the bundle can carry when you stay within safe daily limits. Your results still depend
> on your list and your copy. See [Sending limits](https://docs.maildeck.co/deliverability/sending-limits/).

## Related

  - [Choosing a plan](https://docs.maildeck.co/plans/choosing-a-plan/): From calls you want to the right tier.
  - [Inbox types](https://docs.maildeck.co/plans/inbox-types/): Outlook, Google Workspace and SMTP compared.
  - [Pricing](https://docs.maildeck.co/plans/pricing/): All bundles and per-unit prices.