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Contact Properties can be used to store additional information about your Contacts and then personalize your Broadcasts. Resend includes a few default properties:
  • first_name: The first name of the contact.
  • last_name: The last name of the contact.
  • unsubscribed: Whether the contact is unsubscribed from all Broadcasts.
  • email: The email address of the contact.
You can create additional custom Contact Properties for your Contacts to store additional information. These properties can be used to personalize your Broadcasts across all Segments. Each Contact Property has a key, a value, and optional fallback value.
  • key: The key of the property (must be alphanumeric and underscore only, max 50 characters).
  • value: The value of the property (may be a string or number).
  • fallback_value: The fallback value of the property (must match the type of the property).
You can also create Contact Properties via the API or SDKs.