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

# How to add contacts to the blocklist

This import appends contacts to your project's blocklist.

Imports run from **Settings → Import**. Click **New import** to open the wizard.

## Step 1. Choose an action

* Pick the import type — **Blocklist**.
* Pick the action — **Import to blocklist**.

## Step 2. Prepare and upload the file

1. Decide which fields to include.

   | Field                        | Description                                                                           |
   | ---------------------------- | ------------------------------------------------------------------------------------- |
   | `ContactType` (**required**) | Type of contact to add. See allowed values below.                                     |
   | `Contact` (**required**)     | The contact value itself.                                                             |
   | `CustomFieldSystemName`      | System name of the identifier. **Required** when `ContactType` is `ExternalIdentity`. |

   **Allowed `ContactType` values:**

   * `Email` — email address
   * `MobilePhone` — mobile number
   * `ExternalIdentity` — customer identifier; provide its system name in `CustomFieldSystemName`
   * `Device` — device identifier
   * `DiscountCardNumber` — loyalty card number

2. Prepare the file. Put column headers (field names) in the first row.

   * Format: `.csv` or `.txt`
   * Recommended encoding: UTF-8
   * Make sure values match the expected formats

   See [Preparing a file for import](/import-data/preparing-a-file-for-import) for details.

3. Upload the file and click **Continue**.

## Step 3. Review and start the import

Before launching, Maestra Platform shows the first rows of your file with the mapping applied. Confirm that values land in the correct fields.

If everything looks right, click **Start import**.

## Tracking the import

After it starts, the import appears in the list on the Import page. Each job shows:

* Date started
* Import type
* Who started it

If errors occurred, some rows will have been skipped. Open the import details to see which rows failed and why.

<Warning>
  Adding contacts to the blocklist **does not stop campaigns from sending** to them — they will still receive messages.

  To exclude these contacts from future campaigns, either **clear the contact values** on the matching customer profiles or **delete those customers** from the database. That way, the invalid contacts won't appear on customer profiles and won't be included in campaign recipient lists.
</Warning>