Email API: Batch sending now supports up to 1,000 recipients

The Telnyx Email API now supports up to 1,000 email messages in a single batch request, up from the previous limit of 50. Send large transactional and marketing batches in one API call instead of splitting them across multiple requests.

What is new

• Batch endpoint: Send up to 1,000 messages per request via POST /v2/email_messages/batch. Each message is validated and sent independently.
• Per-message fields: Every message in the batch supports from, to, cc, bcc, reply_to, subject, html_body, text_body, custom headers, attachments, and template_id with per-message template_variables.
• 207 Multi-Status response: All batch responses return HTTP 207. Successful sends appear in data, failures in errors. Per-message failures do not affect other messages in the batch.

Why it matters

• Reduces API calls by 20x: Fewer requests for the same volume of email.
• Simplifies integration logic: One request, one response, no pagination or chunking code.
• Cuts request overhead: Less rate-limit friction and lower total latency for bulk sends.

Getting started

1. Sign up and get your API key.
2. Call POST /v2/email_messages/batch with up to 1,000 messages in the messages array.
3. Check the 207 response: data for successes, errors for any failures.

Learn more in our batch email API reference or explore the Email API product page.