> ## Documentation Index
> Fetch the complete documentation index at: https://docs.summate.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Fastmail Auto-Forwarding Setup

> Set up advanced auto-forwarding with Fastmail's excellent filtering capabilities

<Note>
  Fastmail offers excellent forwarding capabilities with both simple rules and advanced Sieve filters.
</Note>

## Setup Instructions

<Steps>
  <Step title="Create a Forwarding Rule">
    1. Go to **Settings** → **Rules** (or **Filters & Rules**)
    2. Click **Create rule**
    3. Add conditions to identify newsletters:
       * **From** contains common newsletter domains
       * **Subject** contains newsletter keywords
       * **List-Id** header exists (most accurate)
  </Step>

  <Step title="Set Forward Action">
    Choose the action type:

    * **Send a copy to**: Enter `username@inbox.summate.io`
      * Preserves original sender (recommended)
      * Better for DMARC compliance
    * **Forward**: Re-sends from your address
      * Replies come back to you
  </Step>

  <Step title="Advanced Filtering (Optional)">
    For power users, use Sieve scripting:

    ```sieve theme={null}
    # Forward newsletters based on List-Id header
    if header :contains "List-Id" "newsletter" {
      redirect :copy "username@inbox.summate.io";
      keep;
    }
    ```

    Access via Settings → Advanced → Sieve Filtering
  </Step>
</Steps>

<Info>
  Fastmail's "Send a copy to" (redirect) typically has better deliverability than traditional forwarding, especially with strict DMARC policies.
</Info>

## Why Fastmail is Excellent for This

Fastmail is one of the best options for auto-forwarding newsletters because:

* **Powerful filters** - Supports List-Id header matching (most accurate)
* **Sieve scripting** - Advanced users can write custom logic
* **Better deliverability** - "Send a copy to" preserves original sender
* **No limitations** - All plans support full forwarding features

## Next Steps

<CardGroup cols={2}>
  <Card title="Filter Tips" icon="filter" href="/guides/auto-forwarding/filter-tips">
    Learn smart filtering strategies to forward only newsletters
  </Card>

  <Card title="Back to Overview" icon="arrow-left" href="/guides/auto-forwarding/overview">
    Return to the main auto-forwarding guide
  </Card>
</CardGroup>