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How to Use Stream Types

  1. API: Specify stream_type in request body or metadata
  2. SMTP: Add X-Stream-Type header to your email (see SMTP section)
  3. Automatic Selection: If not specified, the default depends on the channel:
    • POST /send defaults to transactional
    • POST /bulk-send defaults to broadcast
    • SMTP defaults to shared

The system automatically optimizes delivery for each stream type to ensure the best inbox placement and deliverability for your emails.