Subscriber is Active in the DE, has an email address, should receive the send. They don't. The reason is almost always one of the three unsubscribe levels. Here's how to tell them apart and diagnose.
Client reports: "I can't get email to send to subscriber X. Their record in the DE is there, Active status, email address correct. What's wrong?"
You check the DE - subscriber is there. You check the sendable setting - correct. You check the email address - valid. Nothing obviously wrong, yet email doesn't arrive.
The cause is almost always one of SFMC's three unsubscribe levels, and knowing which one saves you the hour we wasted the first time we hit this.
The subscriber has opted out of every Marketing Cloud account that uses SFMC. Not just this brand - every brand.
Example: Subscriber A globally unsubscribed from Cloud Kicks's emails a year ago. Cloud Kicks uses SFMC. Later, Northern Trail Outfitters (different company, different SFMC account) imports Subscriber A and tries to send. SFMC blocks the send.
This is the most confusing case because the subscriber is "Active" in your account's records - but Global Unsubscribe is platform-level and overrides the account-level view.
How to check: there's no direct UI for "is this subscriber globally unsubscribed." You can verify via tracking records - if Sent count is 0 and the subscriber is Active, Global Unsubscribe is a strong candidate. Open a support case with Salesforce to confirm.
Global Unsubscribe is rare. If it turns out to be the cause, there's no override - it's the subscriber's platform-level decision.
The subscriber has opted out of every email from this brand/account, but may still receive email from other brands using SFMC.
This is the most common unsubscribe, triggered when a subscriber clicks "Unsubscribe from all" in a Preference Center or the email footer.
Status in All Subscribers flips to Unsubscribed. Future marketing sends skip this subscriber entirely. Transactional sends can still reach them if they're in a Send Classification marked Transactional.
How to check: Email Studio > Subscribers > All Subscribers > search by Subscriber Key or email. If Status shows Unsubscribed, you found it.
The subscriber has opted out of one specific communication category but still receives others from the same brand.
Example: unsubscribed from "Weekly Promotions" Publication List, but still receives "Monthly Newsletter" and "Order Confirmations."
Set up via Publication Lists (Email Studio > Subscribers > Publication Lists). Each send is associated with a specific Publication List, and the subscriber's opt-out per-list is honored automatically.
How to check: look at the Publication List associated with the send, see if the subscriber is unsubscribed from it. Can also check tracking - _ListSubscribers or the Publication List detail UI.
When a subscriber should be receiving email but isn't:
90% of cases resolve at step 2 or 3.
If the client wants granular unsubscribe (subscribers opt out of weekly promos but keep monthly newsletter), Publication Lists are required. Without them, every unsubscribe is an all-or-nothing Primary Unsubscribe.
For B2C with multiple communication categories, set up Publication Lists early:
Each send gets assigned to a Publication List at send time. Subscribers who opt out of one still receive the others.
All three unsubscribe levels must process requests within 10 business days per CAN-SPAM. SFMC processes near-instantly by default; custom Preference Centers that stage requests asynchronously need to respect this window.
Test before production: submit a test unsubscribe, verify the subscriber's status changes in All Subscribers within minutes, and confirm the next test send skips them.
When a subscriber isn't receiving email they should, SFMC is almost always respecting an unsubscribe somewhere - just not the level you looked at. Walk through Primary (All Subscribers status) first, then Publication List membership, then Global as a last resort. Five minutes of checklist work versus an afternoon of random hypothesizing.
Debugging SFMC send failures on specific subscribers? Our Salesforce team runs audits, consent tracing, and Preference Center implementations on production engagements. Get in touch ->
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