Definition
Email subscriber reactivation cost measures the total investment required to move a dormant subscriber back to active engagement status. Costs include campaign creative production, email send costs, any incentive or offer extended to encourage re-engagement, the additional analysis and segmentation work required, and the time value of any list hygiene delays caused by the re-engagement attempt. Comparing reactivation cost against new subscriber acquisition cost helps determine whether re-engagement or replacement is more cost-effective.
Cost Components
- Creative and copywriting for re-engagement campaign
- ESP send costs for the re-engagement sequence
- Incentive cost (discount, free shipping, credit)
- Data analysis and segmentation time
- Opportunity cost of resources not spent on acquisition
Best Practices
- Compare reactivation cost against acquisition cost for your primary channels
- Set a maximum acceptable reactivation cost based on subscriber lifetime value
- Segment reactivation cost by dormant subscriber tier — recently dormant subscribers cost less to reactivate than long-dormant ones
- Test different incentive levels to find the minimum effective reactivation offer
- Include reactivation cost in quarterly programme reporting to track retention efficiency over time
Related Glossary Terms
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.
Email Account Health Score
A composite metric that evaluates the overall health of an email sending programme based on deliverability, engagement, list quality, and compliance factors.
Email Campaign Breakeven Analysis
Calculating the minimum conversions or revenue a campaign must generate to cover all costs including creative production, ESP fees, and team time.
Email Campaign Diminishing Returns
The principle that each additional email send generates less incremental revenue or engagement as frequency increases and inbox competition grows.
Email Campaign Efficiency Score
A composite metric that measures campaign performance relative to its cost, effort and audience size to enable fair comparison across different campaign types.
Email Campaign Profit Leakage
Revenue or margin lost through suboptimal campaign performance, inefficient list management, poor timing, or missed automation opportunities.