Definition
Email data completeness measures how many subscriber profiles contain values for all fields your email programme depends on. If you require first name, birth date, and product preference for segmentation, completeness tracks what percentage of records have all three fields populated. Low completeness limits personalisation capability, reduces segmentation accuracy, and increases the risk of sending irrelevant content to subscribers with missing data.
Key Fields to Track
- Core identity: first name, last name, email address
- Engagement: opt-in date, consent source, consent status
- Demographic: location, age range, gender (where collected)
- Behavioural: purchase history, browsing data, engagement scores
- Preference: email frequency, content interests, product categories
Best Practices
- Define which fields are required vs nice-to-have for your current segmentation strategy
- Calculate completeness separately for required fields and use that as your primary metric
- Implement progressive profiling to collect missing data over time rather than attempting a one-time backfill
- Set completeness targets per field (e.g. 90% for name, 70% for preferences)
- Design data collection touchpoints (preference centres, surveys, transactional emails) to target specific completeness gaps
Related Glossary Terms
Abandoned Cart Email
An abandoned cart email is an automated message sent to customers who added items to their online shopping cart but left without completing the purchase. It is one of the highest-converting email types in ecommerce.
ARPU (Average Revenue Per User)
ARPU (Average Revenue Per User) is a metric that measures the average revenue generated per email subscriber over a specific period, used to evaluate list value and campaign effectiveness.
Attention Rate
Attention rate is the percentage of email opens that last longer than 5 seconds, distinguishing genuine reads from passive opens, preview-pane views, or Apple MPP auto-loads.
Bounce Rate Threshold
A bounce rate threshold is the percentage of hard or soft bounces at which email platforms and ISPs begin to penalise sender reputation, typically around 2-5%.
Bounce Rate
Email bounce rate is the percentage of emails that were rejected by the receiving server before reaching the recipient. It is a key indicator of list health and data quality.
Campaign Lifted Revenue
Campaign lifted revenue is the additional revenue generated by an email campaign beyond what would have occurred without it, measured via a holdout group or statistical lift analysis.