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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