Privacy: what happens to your data
Your messages stay on your Mac. The license server sees only what it needs to verify a license.
3 min read · updated Nov 8, 2026
On your Mac
| What | Where | What for |
|---|---|---|
| The configuration (which folders, which labels) | ~/Library/Application Support/Klasor/config.tsv | So it knows what to label. |
| Status, working mode, last export | state.plist | The Status page. |
| The History screen | history.tsv | The History screen. |
| Notifications | Shown by macOS on your Mac (new version, export finished, license expiry, no scan in 7 days) | Local only: Klasor sends nothing for them. |
| Technical log | run.log (the last 500 lines; may contain folder names, never sent anywhere) and codes.log (error codes only) | Troubleshooting. |
| Search index of your exports (Archive and Deleted by Klasor) | ~/Library/Application Support/Klasor/index/ | Search. Built and kept on your Mac only. |
| The list of moved messages and the details to restore them | DELETED.csv and MANIFEST-META.csv, inside each export folder | Deleted by Klasor and restoring. |
| Temporary export copies | ~/Library/Application Support/Klasor/staging.noindex/ | Deleted after verification. |
| The license | license.json | Offline operation; not deleted by “Reset.” |
On the license server
When you verify or activate a license, the server receives:
- a Mac ID (a hash), computed from the hardware and product ID (it can’t be correlated across products and it isn’t the serial number),
- the app version,
- during the trial, the number of messages processed (only the number),
- the IP address and time of the request (in the rate-limit table it is deleted after 24 hours; in the security logs, at most 90 days, deleted automatically).
The server never sees messages, subjects, files, folder names, or your Mac’s name. The license key is stored in the server’s database only as a hash. The full list, the legal bases and your rights: Privacy policy.
Exports
They’re saved where you choose. If you choose iCloud or SharePoint, the messages become visible in that account or to that team; choose another location if your policy doesn’t allow it.
Freeing space, restoring, searching and viewing messages all happen on your Mac and send nothing to us or anyone else. The message viewer makes no network requests.
Diagnostics
Errors in the app have a code (for example KL-102) that you can quote directly. The diagnostics report contains no messages, subjects, folders, paths, or e-mail addresses; the only identifier is the Mac ID (first 8 characters). You see it before you send it, and you confirm the sending.