Feature
v2.4.0
Scheduled sends
Pass send_at to queue a message for later. Cancel it any time before it goes out.
You can now schedule a message up to 30 days ahead by passing an ISO 8601 timestamp in send_at. Scheduled messages show the scheduled status and can be cancelled with DELETE /v2/messages/{id}.
Availability
Scheduled sends are on every plan. The Node and Python SDKs support send_at from version 2.4.