# Choosing triggered, transactional, journey or user-initiated sends

*Marketing Cloud Engagement Consultant Study Guide · Messaging · Last updated November 3, 2026 · https://www.certifyforce.com/study-guide/marketing-cloud-engagement-consultant/messaging/choosing-triggered-transactional-journey-or-user-initiated-sends*

How to match a requirement to an audience-driven or event-driven send: classic triggered sends versus the Transactional Messaging API, triggered send settings, user-initiated audiences and exclusions, Transactional Send journeys and Single Send journeys.

- Certification: Salesforce Marketing Cloud Engagement Consultant
- Exam section: Messaging
- Study guide: https://www.certifyforce.com/study-guide/marketing-cloud-engagement-consultant

**Official exam objective:**

> Given a customer scenario, determine the appropriate messaging option.

## What the exam expects

- Classify a planned message as audience-driven or event-driven and name the send method that fits.
- Choose between a classic triggered send and the Transactional Messaging API from channel, throttling, priority, exclusion and deduplication needs.
- Recommend triggered send settings: priority, subscriber management, Multipart MIME, data obscuring and the definition limit.
- Build a user-initiated audience and exclusions that the interaction accepts.
- Configure Transactional Send and Single Send journeys within their limits.
- Key terms: **send definition** (the reusable setup a send uses); **classic triggered send** (an Email Studio triggered email called by SOAP or REST); **Transactional Messaging API** (the REST API for email, SMS and push transactional messages); **messageKey** (a unique ID per request); **user-initiated send** (an interaction a user starts manually).

## Key facts

| Fact | Detail | Source |
|---|---|---|
| Classic triggered send channels | Email only | [Compared to Classic Triggered Sends](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/transactional-messaging-comparison.html) |
| API filtering | No suppression lists or exclusion scripts | [Transactional Messaging API](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/transactional-messaging-api.html) |
| API deduplication | `messageKey`, not a data extension primary key | [Transactional Messaging API](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/transactional-messaging-api.html) |
| Message key uniqueness | Across the business unit's sends for 72 hours; a duplicate gets an error | [Transactional Messaging Best Practices](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/transactional-messaging-best-practices.html) |
| Client-credentials token for a business unit | MID in `account_id` on `v2/token` | [OAuth 2.0 Integration Considerations](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/integration-considerations.html) |
| REST and SOAP APIs | Shared OAuth2; no full parity; SOAP for most email functions | [API References](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/apis-overview.html) |
| Definition limit | 500 triggered plus transactional per business unit per 7 days | [Transactional Messaging API](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/transactional-messaging-api.html) |
| Low priority | Queued every 5 minutes, then up to 5 minutes to send | [Triggered Emails](https://help.salesforce.com/s/articleView?id=mktg.mc_es_triggered_emails.htm&type=5&language=en_US) |
| No list selected | Hidden Triggered Send Managed List is used | [Create a Triggered Email](https://help.salesforce.com/s/articleView?id=mktg.mc_es_create_triggered_email_interaction.htm&type=5&language=en_US) |
| Default error threshold | 10; the first error stops sends | [Create a Triggered Email](https://help.salesforce.com/s/articleView?id=mktg.mc_es_create_triggered_email_interaction.htm&type=5&language=en_US) |
| User-initiated data extension audience | Exactly one | [User-Initiated Email Messages](https://help.salesforce.com/s/articleView?id=mktg.mc_es_email_messages.htm&type=5&language=en_US) |
| Transactional Send journey name | Can't change after activation | [Create a Transactional Send Journey](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_create_transactional_journey.htm&type=5&language=en_US) |
| Single Send Einstein activities | Not supported with the SMS activity | [Create a Single Send Journey](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_create_single_send_journey.htm&type=5&language=en_US) |

## Check yourself

- When a user starts a user-initiated send with the same email and recipients as a previous send, what does Email Studio do?
- When a Single Send journey's schedule is set to On Activation, when does it send?
- Where do you monitor aggregate sends, opens, clicks and unsubscribes for a classic triggered send?
- Which Einstein activity appears first when a Single Send journey uses both?

## Sources

- [Transactional API Sends Compared to Classic Triggered Sends](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/transactional-messaging-comparison.html)
- [Transactional Messaging API](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/transactional-messaging-api.html)
- [Transactional Messaging API Best Practices](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/transactional-messaging-best-practices.html)
- [OAuth 2.0 API Integration Considerations](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/integration-considerations.html)
- [Marketing Cloud Engagement API References](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/apis-overview.html)
- [Triggered Emails in Email Studio](https://help.salesforce.com/s/articleView?id=mktg.mc_es_triggered_emails.htm&type=5&language=en_US)
- [Create a Triggered Email Message Interaction](https://help.salesforce.com/s/articleView?id=mktg.mc_es_create_triggered_email_interaction.htm&type=5&language=en_US)
- [User-Initiated Email Messages](https://help.salesforce.com/s/articleView?id=mktg.mc_es_email_messages.htm&type=5&language=en_US)
- [Transactional Send Journeys](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_transactional_send_journeys.htm&type=5&language=en_US)
- [Create a Transactional Send Journey](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_create_transactional_journey.htm&type=5&language=en_US)
- [Clear a Transactional Send Journey Queue](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_clear_transactional_journey_queue.htm&type=5&language=en_US)
- [Update an Email Activity in a Transactional Send Journey](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_update_email_in_transactional_send.htm&type=5&language=en_US)
- [Create a Single Send Journey](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_create_single_send_journey.htm&type=5&language=en_US)
- [Choose Your Send Method (Trailhead)](https://trailhead.salesforce.com/content/learn/modules/marketing-cloud-send-methods-quick-look/choose-your-send-method)

## About the full unit

The "Core concepts", "Exam traps" and "Worked scenario" sections of this unit, its 18 linked practice questions, and unlimited timed mock exams are included with the Marketing Cloud Engagement Consultant pack (USD $19): https://www.certifyforce.com/practice-exams