Free
$0 / month
One mailbox, up to 300 messages a day.
- Phishing protection
- Tracker stripping
- 7-day logs
The quiet filter for every inbox.
Kestrel stops phishing, tracking pixels and spam before they land — on every mailbox and every device, with no plugin to install.
Try it free
No card required.Create an account later to keep your settings.
Security
Catch phishing in the first second.
Every message is checked against dozens of signals before delivery: newly registered domains, lookalike addresses, redirect chains and password-protected attachments.
Threat lists refresh every minute, so an attack that started this morning is already on the list.
- Lookalike domains
- Malicious links
- Reply-chain hijack
- QR phishing
- Invoice fraud
- New senders
- Locked archives
Privacy
Opening an email no longer reports back.
Tracking pixels are removed, images load through a proxy and tracking parameters are stripped from links. Senders can't tell when or where you read.
Every protection is a single switch. Turn it on — that's it.
Privacy
Changes are saved instantly.
Strip tracking pixels
Removes 1×1 images and open beacons.
Proxy remote images
Hides your IP address and location.
Clean links
Removes utm parameters and click IDs.
Messages checked / day48M
Median check time38 ms
Phishing caught99.4%
Mailboxes protected310K
Three minutes. Nothing to install.
- Add your addressKestrel creates a private forwarding address.
- Turn on forwardingOne setting in your current mail provider — we show you where.
- Choose your switchesThe defaults suit most people.
- Verify your domainAdd a single TXT record.
- Point MX to KestrelMail is delivered to your current server after inspection.
- Set team policiesShared rules, per-person exceptions.
# Score a message before delivery curl https://api.kestrel.example/v1/score \ -H "Authorization: Bearer $KESTREL_KEY" \ -d '{"from":"billing@vendor-pay.net","links":3}' # → {"verdict":"quarantine","signals":["new_domain","lookalike"]}
Pricing
Start free. Upgrade when it matters.
Pro
Popular$4 / month$40 / year
Five mailboxes, unlimited messages.
- Everything in Free
- Quarantine & review
- Custom rules
- 90-day logs
Team
$3 / seat / month$30 / seat / year
For company domains and central policy.
- Everything in Pro
- Single sign-on
- 1-year logs & export
Questions
Does Kestrel read my email?
Messages are scanned automatically in memory and their content is never stored. Logs keep only the sender, time and verdict.
What if an important message is blocked?
Suspicious mail is quarantined, never deleted. Release it in one click and add the sender to your allowlist.
Which mail providers does it work with?
Any provider that supports forwarding or custom MX records.
Get started
Quiet your inbox today.
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