Definition
Marginal revenue per send measures whether each additional email you send is economically worthwhile. The first email of the week might generate significant revenue. The seventh email might generate almost nothing while still costing send volume and risking unsubscribes.
How It Works
Track revenue by send position within a week or month. Plot send count against total revenue. The point where the curve flattens is your marginal revenue ceiling. Sending beyond it adds cost without meaningful return.
Why It Matters
Most senders optimise for per-campaign ROI while ignoring the declining marginal returns of high frequency. Marginal revenue analysis helps you find the frequency sweet spot that maximises total revenue without wasting send volume or burning subscriber goodwill.
Best Practices
- Start with the fundamentals of Marginal Revenue Per Email Send and build from a clear baseline, so later improvements are measurable rather than assumed.
- Keep Marginal Revenue Per Email Send consistent with how the rest of your email programme works, so no single initiative works against another.
- Review how Marginal Revenue Per Email Send is handled in your own data and adjust from what you see, rather than copying what another brand does.
- Test one change at a time and measure the effect before rolling it out more widely.
- Revisit your approach to Marginal Revenue Per Email Send regularly, because audience behaviour and inbox technology keep moving.
- Make sure the basics — relevance, timing, and honesty — are solid before chasing more advanced tactics.
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Related Glossary Terms
A/B Testing
A/B testing in email marketing is the practice of sending two variations of an email to a small sample of your list to determine which version performs better before sending the winner to the remaining subscribers.
Account-Based Marketing Email
An account-based marketing email is a highly targeted message sent to a specific organisation or decision-maker group as part of a focused B2B strategy.
Announcement Email
An announcement email is a dedicated campaign that communicates a specific update, milestone, or change to subscribers, from product launches and feature releases to company news and events.
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.
Average Order Value in Email
Average order value in email is the average amount spent per transaction from recipients who clicked through from an email campaign.
Frequently Asked Questions
Good practice here means handling Marginal Revenue Per Email Send in a way that is relevant, timely, and honest for your audience. Marginal revenue per email send is the additional revenue generated by sending one more email to the list, accounting for diminishing returns from oversending. Done well, it improves engagement and builds trust; done poorly, it creates friction that costs you results.
Because it touches the parts of email that drive outcomes: relevance, trust, and delivery. Small improvements compound, while repeated mistakes quietly erode the health of your programme.
The most common problems are treating Marginal Revenue Per Email Send as a one-off task, ignoring what the data says, and copying competitors without testing. All three lead to effort that does not translate into better results.
Compare the metrics it should influence — engagement, conversions, and deliverability — before and after you make changes. Trends over time matter far more than any single send.
It supports the same goal as the rest of your email programme: the right message to the right person at the right time. Aligned with segmentation and automation, it reinforces everything else rather than competing with it.