Definition
The attribution window defines how long after an email send a conversion still counts as driven by that campaign. A 7-day window means any purchase occurring within 7 days of a click is attributed to the email; purchases after day 7 are not.
Common Windows
- 1-day window: Conservative, used when email is purely a direct-response channel
- 7-day window: Standard for most ecommerce and B2C campaigns
- 28-day window: Common for B2B and high-consideration purchases
- Session-based window: Attributing only if the conversion happens in the same browsing session as the click
Why It Matters
A window that is too short undercounts email's contribution to longer consideration cycles. A window that is too long overcounts it by capturing conversions that other channels deserve credit for. Testing different windows against a holdout group is the only way to find the right balance for your business.
Best Practices
- Start with the fundamentals of Email Attribution Window and build from a clear baseline, so later improvements are measurable rather than assumed.
- Keep Email Attribution Window consistent with how the rest of your email programme works, so no single initiative works against another.
- Review how Email Attribution Window 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 Email Attribution Window 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.
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.
Abuse Complaint
An abuse complaint is a report from a recipient who marks an email as spam, which negatively affects sender reputation and deliverability.
AI Email Summary
An AI email summary is a short, machine-generated overview of an email's key points, shown by Gmail, Outlook and Apple Mail before a recipient opens the message. It is reshaping how email marketers think about subject lines, preview text and open rates.
AI Inbox Summary
An AI inbox summary is an AI-generated digest that condenses unread email — often highlighting news, actions and senders — changing how clearly your marketing email reaches and engages subscribers.
AI Inbox
An AI inbox is an email client that uses artificial intelligence to summarise, sort, prioritise and sometimes answer emails before the human recipient reads them. It is transforming email marketing metrics and copywriting.
Frequently Asked Questions
Good practice here means handling Email Attribution Window in a way that is relevant, timely, and honest for your audience. An email attribution window is the time period during which a click or conversion is credited to an email campaign, typically ranging from 1 to 28 days after send. 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 Email Attribution Window 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.