Updates
API changelog
Public changes to RouteKite’s supported developer contract.
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August 28, 2026
Added direct Base64 attachments while preserving the uploaded attachment workflow.
- Files up to 5 MB can be embedded in POST /api/v1/emails.
- Direct and uploaded attachments can be mixed in delivery order.
- The combined decoded limit remains 10 MB.
- Direct files are retained privately for delivery and retries and never appear in Assets.
August 28, 2026
Hardened transactional API acceptance and delivery recovery.
- Added per-key and workspace short-window limits.
- Added Retry-After and RateLimit response headers.
- Added optional per-message reply_to.
- Added email event timeline retrieval.
- Added field-level validation details without breaking the existing error envelope.
August 27, 2026
Added private transactional attachments without changing attachment-free requests.
- Added prepare, complete, and retrieve attachment endpoints.
- Added the optional attachments field to email creation.
- Added attachment retention, validation, limit, and lifecycle errors.
- Added a machine-readable OpenAPI document.
August 25, 2026
Introduced the versioned transactional email API.
- Added one-recipient email creation.
- Added message status retrieval.
- Added required retry-safe idempotency.
- Added normalized delivery states and request identifiers.