# Troubleshooting send counts and skipped subscribers

*Marketing Cloud Engagement Specialist Study Guide · Subscriber and Data Management · Last updated October 29, 2026 · https://www.certifyforce.com/study-guide/marketing-cloud-engagement-specialist/subscriber-and-data-management/troubleshooting-send-counts-and-skipped-subscribers*

A checklist for when fewer emails go out than the audience holds: the JobID, de-duplication, scheduled-send audience changes, Contact Delete, sendable data extension setup (one EmailAddress field), triggered send and journey checks, and the tools that explain skips: Alert Manager, NotSent extracts, send logging and RaiseError logs.

- Certification: Salesforce Marketing Cloud Engagement Specialist
- Exam section: Subscriber and Data Management
- Study guide: https://www.certifyforce.com/study-guide/marketing-cloud-engagement-specialist

**Official exam objective:**

> Given a customer scenario, identify and troubleshoot send discrepancy based on subscriber preference management.

## What the exam expects

- Work through the documented checks when a send reaches fewer people than the audience: status, exclusions, List Detective, Contact Delete, data extension setup.
- Explain de-duplication across several data extensions and audience changes between scheduling and sending.
- Diagnose triggered sends that return Queued and journey email activities that skip contacts.
- Pick the right tool: Alert Manager for job-level errors, a NotSent tracking extract for per-subscriber reasons, send logging and a RaiseError log for skips.
- Key terms: **JobID** (unique identifier of one send, the anchor for tracking); **NotSent tracking extract** (a reason per subscriber who wasn't sent); **Alert Manager** (notifies an admin of send errors); **RaiseError** (AMPscript function that skips one subscriber); **Contact Delete** (deletion process that blocks all sends to a contact).

## Key facts

| Fact | Detail | Source |
|---|---|---|
| First check | Subscriber must be Active; others are skipped silently | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |
| Data extension duplicates | De-duplicated by email address; one email each | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |
| Scheduled sends | Audience can change before the send | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |
| Contact Delete | Blocks all sends, transactional included; NotSent reason Subscriber Deleted | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |
| EmailAddress fields | Exactly one, or new subscribers aren't created | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |
| Asynchronous trigger | Shows Queued without a reason | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |
| Non-Running definition | Returns an error or queues requests | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |
| Journey email activity | Skips unsubscribed or too-often-bounced contacts on its publication list | [Managing Contacts in a Journey Builder Email Activity](https://help.salesforce.com/s/articleView?id=mc_jb_managing_contacts.htm&language=en_US&type=5) |
| Alert Manager | Notifies an admin of send errors | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |
| NotSent extract | Reason per skipped subscriber, by JobID | [Troubleshooting Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1) |

## Check yourself

- What is a JobID?
- When does a journey email activity send regardless of subscription status?
- When does a journey email activity check All Subscribers instead of a chosen publication list?
- Why can a wrong Send Relationship email people who opted out?

## Sources

- [Engagement - Troubleshooting Marketing Cloud Engagement Email Sends](https://help.salesforce.com/s/articleView?id=000389518&language=en_US&type=1)
- [Managing Contacts in a Journey Builder Email Activity](https://help.salesforce.com/s/articleView?id=mc_jb_managing_contacts.htm&language=en_US&type=5)
- [Bounce Mail Management in Email Studio](https://help.salesforce.com/s/articleView?id=sf.mc_es_bounce_mail_management.htm&language=en_US)

## About the full unit

The "Core concepts", "Exam traps" and "Worked scenario" sections of this unit, its 9 linked practice questions, and unlimited timed mock exams are included with the Marketing Cloud Engagement Specialist pack (USD $19): https://www.certifyforce.com/practice-exams