Definition
Anonymization strips personal identifiers from subscriber records — such as email address, name, and IP address — so the remaining data cannot be traced back to a specific person. This differs from pseudonymization, which replaces identifiers with tokens that could theoretically be reversed.
Methods
- Field deletion: Removing name, email address, and other direct identifiers
- Aggregation: Combining records into groups so individuals cannot be distinguished
- Noise addition: Adding random data to mask individual values while preserving statistical patterns
- Hashing: Irreversibly transforming email addresses into a hash value that retains uniqueness but cannot be reversed
Why It Matters
Under the GDPR, anonymized data is no longer considered personal data and can be retained indefinitely for analytical purposes. This allows you to keep trend data and performance history after a subscriber unsubscribes without violating privacy regulations.
Related Glossary Terms
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AIDA Model for Email
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AMP for Email
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Anchoring Effect in Email Marketing
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Announcement Email
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