Skip to main content
DELETE
/
emails
/
scheduled
/
{transmissionId}
Cancel Scheduled Email
curl --request DELETE \
  --url https://app.lettr.com/api/emails/scheduled/{transmissionId} \
  --header 'Authorization: Bearer <token>'
{
  "message": "Scheduled transmission cancelled successfully."
}

Documentation Index

Fetch the complete documentation index at: https://docs.lettr.com/llms.txt

Use this file to discover all available pages before exploring further.

Cancel a scheduled email transmission before it is sent. Once the scheduled delivery time has passed, the transmission can no longer be cancelled.

Authorizations

Authorization
string
header
required

API key for authentication

Path Parameters

transmissionId
string
required

The transmission ID returned when the email was scheduled.

Example:

"12345678901234567890"

Response

Scheduled transmission cancelled successfully