# Audiences
The Audiences page provides an easy way to store addresses for mailing and suppression. This is especially helpful if you want to suppress a list for an individual campaign, separate from the global Do Not Mail List. Upload a CSV file comprised of either mailing addresses, or email addresses if you opt to use the address enrichment feature.
## Required Fields
Below is an example of the required and optional fields for full address data, and emails for address enrichment. The column headers don't need to match perfectly as you'll be prompted to map the required headers upon upload, and ignore any irrelevant columns that may be present in your file.
**Suppressions** are matched against either address or email, so if you are running campaigns using address enrichment, email alone can be used for suppression.
### **Mailing Address Data**
Custom **merge tag** columns can be stored for creative, we recommend downloading your creative's CSV [Data Guide](https://docs.heypoplar.com/campaign-setup/creative#data-guides) for a quick, easy and accurate file template.
| full\_name |
required max character count: 40
|
| ------------ | --------------------------------------------------------------------- |
| company | *optional* |
| address\_1 | **required** |
| address\_2 | *optional* |
| city | **required** |
| state | **required** |
| postal\_code | **required** |
| email | *optional* |
| identifier | *optional* |
### **Emails for Address Enrichment**
| email | **required** |
| ---------- | ------------ |
| full\_name | *optional* |
| identifier | *optional* |
### Merge Tag Columns
When uploading an audience file that contains extra columns with merge tag data, map any and all of those columns as **Merge Tag**:
In the [One Time Send](https://docs.heypoplar.com/platform-basics/one-time-sends) flow during launch, you'll have the option to map these values to their respective merge tags.
## Do Not Mail List
Maintain your Do Not Mail list by manually uploading a CSV list or integrating with our [Do Not Mail API](https://app.gitbook.com/s/xfN4IIBsOUuqBd0ERnDW/endpoints/do-not-mail). Members of this list are **automatically suppressed across all campaigns.**
## Customers (Orders API)
If you're sharing transactional data with Poplar via [Shopify](https://apps.shopify.com/poplar-1) or integration with our [Orders API](https://app.gitbook.com/s/xfN4IIBsOUuqBd0ERnDW/endpoints/orders)**,** a list of all your customers will automatically populate this audience which can be optionally selected if you'd like to suppress customers who've already purchased.
{% hint style="warning" %}
If you notice duplicate addresses in the list, this is because both **shipping** and **billing** address are captured through Shopify.
{% endhint %}
