Salesforce Mass Email (available in Salesforce Classic) and List Email (available in Lightning Experience) do not include a built-in dynamic unsubscribe option. This article explains the available workarounds for adding opt-out or unsubscribe functionality to outbound emails sent from Salesforce.
Note: Mass Email is available in Salesforce Classic. List Email is available in Lightning Experience.
Salesforce does not natively include an unsubscribe mechanism for Mass Emails or List Emails. To add opt-out and unsubscribe capability, the following options are available:
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