Create a Triggered Send Definition

This documentation applies only to triggered sends that are managed in Email Studio. To use the transactional messaging REST API, review Transactional Messaging API.

Create a triggered send definition that an external application can reference to send a message to subscribers. For example, send an email when subscribers submit a sign-up form.

You can create up to 500 email send definitions in a 7-day period per business unit. This limit doesn’t apply to the Journey Builder email activity triggered send definition.

When you update a triggered send definition via the SOAP API with the Email object, you must set the EmailSubject property on the triggered send definition. If you don’t pass the new subject to the triggered send definition, it retains the old subject for that definition.