> For the complete documentation index, see [llms.txt](https://dexcore.gitbook.io/guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dexcore.gitbook.io/guide/dexcore-guide-es/setup/best-practices/master-emails.md).

# Master Emails

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**What is a master email?** It's the inbox where forwarded/redirected emails from your Outlook accounts are delivered. Instead of logging into each account separately, all emails arrive in one (or a few) master inboxes.
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***

## Recommended Ratio

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Keep a **1:100 ratio** — one master email should handle no more than **100 forwarded accounts**.
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### Why?

When too many accounts forward to a single inbox:

* 📨 Email delivery gets **delayed** (minutes → hours)
* 🚫 The mail provider may flag the inbox for **unusual activity**
* 📊 It becomes **harder to manage** and sort incoming emails

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## What Can Be a Master Email?

Any inbox that can receive forwarded emails works as a master email. Common options:

| Option                  | How it works                                                                                                                                                           |
| ----------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Gmail / any mailbox** | Outlook forwards directly to your Gmail or other email address                                                                                                         |
| **Catch-all domain**    | Outlook forwards to an address on your domain (e.g. `master@yourdomain.com`). Your domain catch-all receives it and delivers to the master inbox linked to that domain |

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The catch-all approach is common when you already have a domain set up for recovery emails — you can reuse it for master inboxes too.
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## Example Setup

| Master Email           | Accounts Forwarded | Status                     |
| ---------------------- | ------------------ | -------------------------- |
| <master1@gmail.com>    | 1–100              | ✅ Good                     |
| <master2@gmail.com>    | 101–200            | ✅ Good                     |
| <inbox@yourdomain.com> | 201–300            | ✅ Good (catch-all)         |
| <single@gmail.com>     | 1–500              | ❌ Too many — expect delays |

***

## Tips

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* Use **separate master inboxes** (Gmail, custom domain, or any provider) for each batch of 100 accounts
* Label or filter emails in each master inbox for easier management
* You can use a **different forwarding email per account** in the task file
  {% endhint %}

{% hint style="warning" %}
Spread accounts across multiple master emails to avoid delivery problems and potential flags.
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