What’s the difference between global vs list-specific unsubscribes?
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When you open your ESP's suppression settings, you'll find two distinct buckets: addresses suppressed from one specific list, and addresses on your master suppression list that block all sends from your account. Those buckets behave very differently, and mixing them up is one of the more common compliance mistakes senders make when they migrate to a new platform.
A list-specific unsubscribe marks an address as opted out of one content category or sending list. Your ESP skips it when sending from that list but will still deliver email from your other active lists. This is the mechanism that makes preference centers possible: one address can be opted out of your promotional list while staying active on your newsletter and transactional lists at the same time.
A global unsubscribe goes on your master suppression list, which your ESP checks against every send regardless of the source list. CAN-SPAM requires you to honor these within 10 business days; GDPR requires immediate processing. Once an address is globally suppressed, don't send marketing email to it. If someone opts back in later through a new sign-up form, most ESPs require you to manually remove the suppression before they'll receive mail again.
The migration trap: if you add a new sub-account or move to a different ESP, your global suppression list doesn't transfer automatically. Export your suppressed addresses and import them into your new sending environment before your first send. Skipping this step is one of the fastest ways to damage your sender reputation, because you'll be mailing people who explicitly asked to stop hearing from you.
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