Send Custom Properties From Postscript Popups to Subscriber Profiles in Mailchimp

   Have you set up your Mailchimp integration? Before sending email data to Mailchimp, be sure you've set up your integration. You can learn how to connect Mailchimp and Postscript here.

Postscript popups continue to be a powerful (and compliant) way to collect SMS subscribers. But did you know that in addition to collecting phone numbers, you can also configure your Postscript popup to collect email? And if you have an active Mailchimp integration, you can send that email data to Mailchimp.

Before We Begin

It's important to make sure your account is set up to properly pass data from Postscript to Mailchimp. Please review the following items before getting started.

  • In order for data to properly pass from Postscript to Mailchimp, please ensure the integration is configured correctly.
  • Make sure your Postscript popup is set up to collect emails and custom properties. View these guides if you need support updating your desktop popup or mobile popup.
  • Ensure you've selected a Mailchimp list to forward Postscript popup-collected emails to. We discuss this in more detail below.
  • Finally, in order for custom properties to be forwarded to Mailchimp, the Audience Field in Mailchimp needs to be pre-defined. We also discuss this in more detail below.

Forward Emails from Postscript Popups to Mailchimp Lists

To send custom properties to Mailchimp subscriber profiles, select a Mailchimp list for forwarding Postscript popup-collected emails.


  1. Select Acquisition in the side menu of your Postscript dashboard.
  2. Select the popup that you'd like to forward emails from to Mailchimp.
  3. Under the popup name, select the + Add Step/Custom Step tab. When you select + Add Step, you are able to add an additional step for subscribers to enter their email address. You can also use this second step to collect custom properties.
  4. When collecting emails, you can toggle the Forward to email app option ON and select which list you'd like to forward the collected emails and custom properties to.

Defining Audience Fields in Mailchimp

The corresponding property in Mailchimp called Audience Field needs to be pre-defined before forwarding custom properties. Then, the custom property within Postscript needs to be the exact same as the associated Audience Field name within Mailchimp.


  1. From your Mailchimp admin, select Audiences on your left-side navigation panel.
  2. Select All contacts. Then select the Settings tab. Choose Audience fields and *MERGE* tags.
  3. Select the Add A Field button to add your property and custom field.
  4. Label your field, then under the Put this tag in your content column, add your subscriber property. Keep in mind, this subscriber property needs to be verbatim what's listed as the subscriber property in Postscript (tip: in this example, we use SKN_CNCRN).
  5. Select the Save Changes button.

Set Up Custom Property Collection in Postscript

Under the Form card within the popup editor, you can customize the questions for your popup.


  1. Within your popup, you can select Add Question to add a question to your popup. Choose if you'd like subscribers to answer this question via freeform text, multiple choice, or by entering a date. Their response will be added to both their subscriber profile in Mailchimp and Postscript.
  2. Within the first field, craft your question copy (for example: what's your main skin concern? or when is your birthday?). 
    • If adding a multiple choice option, be sure to add the options. You can add up to four.
  3. Under Subscriber property, add the property name that you added to your Mailchimp account earlier in this article. In this example, we use "SKN_CNCRN" (reminder: This subscriber property needs to be verbatim what's listed in Mailchimp).
  4. Once your subscriber property is listed the same in Postscript as it is in Mailchimp, you can save your changes by selecting Save in the upper-right corner of the popup editor.
  5. When subscribers fill out your popup, their custom property will be sent to Mailchimp.

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