Inbox
Send Reply
Send a reply to an inbox thread.
POST
Path Parameters
string
required
The unique identifier of the reply thread to respond to.
Body Parameters
string
required
The reply message body (plain text or HTML).
string
Optional subject line override. Defaults to
Re: <original subject>.Response
object
Errors
Rate Limit
- 100 requests per minute, per API key. Fixed 60-second window.
- Every response includes
X-RateLimit-Limit,X-RateLimit-Remaining, andX-RateLimit-Reset(unix epoch seconds). - A
429response includes aRetry-Afterheader (seconds until the bucket resets).
Retry-After, exponential backoff, monitoring X-RateLimit-Remaining), see Rate Limiting.