Inactive Email Detector
Flag inactive contacts from your own last-active dates against a chosen threshold, separating active from dormant. Free, runs entirely in your browser.
Detect inactive contacts
Paste rows of “email, last-active date”. We flag contacts inactive beyond your threshold.
What this inactive detector does
Common use cases
- 1Building a re-engagement segment
- 2Suppressing long-dormant contacts
- 3Improving open rates by pruning dead weight
- 4Preparing a sunset policy
- 5Cleaning a list before a big send
- 6Reporting engagement decay
Related tools
About inactive contacts
Inactive contacts — those who have not opened or clicked in months — quietly damage deliverability. Mailbox providers watch engagement, so repeatedly emailing people who never interact drags down your inbox placement for everyone on the list.
True inactivity can only be judged from your engagement data, which is why this tool works from the last-active dates you provide rather than guessing from the address. Paste your export, set a threshold (six months is common), and it separates the dormant contacts so you can re-engage or suppress them. Everything is processed in your browser.
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Got Questions? We Have Answers.
How does it detect inactivity?
You paste rows of "email, last-active date" and set a threshold; it flags every contact whose last activity is older than that window.
Why does it need my dates?
True inactivity can only be judged from your engagement data — an address alone cannot reveal whether someone still opens your mail.
Why prune inactive contacts?
Providers watch engagement; repeatedly emailing people who never interact drags down inbox placement for your whole list.
Is my data uploaded?
No. Everything is processed in your browser and nothing leaves your device.