Skip to main content

Personalizations​

The personalizations field is an array of objects that allows for customization of email properties on a per-recipient basis. This feature enables sending the same email to multiple recipients with individualized content and settings.

Structure​

"personalizations": [
  {
    "to": [],
    "cc": [],
    "bcc": [],
    "subject": "",
    "headers": {},
    "dkim_domain": "",
    "dkim_private_key": "", // Base64 encoded
    "dkim_selector": "",
    "dynamic_template_data": {}
  }
]

Key Points​

  • The to field is the only required property within each personalization object.
  • Properties like subject, from, and reply_to can be defined globally or within each personalization object.
  • When a property is defined both globally and in a personalization object, the personalized value takes precedence.

Example: Multiple Recipients with Custom Subjects​

"personalizations": [
  {
    "to": [{ "email": "banana-lover123@example.com" }],
    "subject": "BANANAS ARE ON SALE"
  },
  {
    "to": [{ "email": "apple-lover123@example.com" }],
    "subject": "APPLES ARE ON SALE"
  }
]

This structure allows for:

  • Sending to multiple recipients
  • Customizing subject lines per recipient
  • Applying different headers or DKIM settings per email
info

DKIM fields (i.e. dkim_domain, dkim_private_key, dkim_selector) and Email Template fields (i.e. dynamic_template_data) will be covered in separate sections.

By leveraging personalizations, you can create highly targeted and individualized email campaigns within a single API call.