After consolidating old subscriber data, sending an opt-in email to reconfirm consent is the best approach to ensure compliance and reduce complaints. This practice helps clean the list by confirming that recipients still want to receive communications, reducing spam complaints and increasing engagement rates by re-engaging with interested subscribers.

Why Opt-In is Necessary Post-Consolidation: Data from legacy systems may be outdated, and subscribers may no longer be interested in the brand. A reconfirmation email allows Northern Trail Outfitters to respect subscriber preferences and minimize potential complaints.

Salesforce Documentation Reference: See Opt-In Best Practices for more information on managing consent in Marketing Cloud.