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How Can I Find Out Why a User Unsubscribed From My Email?
You can access this information under reports. See Reports --> Activity --> Unsubscribers.
How Can I Reactivate Unsubscribed Addresses?
How can I manually unsubscribe a user?
How Can I Make Sure That Certain Users No Longer Receive My Newsletter?
Are unsubscribed addresses and bounces overwritten when importing a new list?
Can I manually view, correct and reactivate hard bounce addresses?
How Does the Blacklist Function Work?
How Many Mailing Lists / Groups / Segments Can I Create?