Give each company its own alias. When spam arrives, you can see which alias it came to, and you can switch just that one off.
Spam
- Switch the alias off in the Aliases tab. Your other aliases keep working.
- Still need that company? Make a new alias for it.
How Kuuko notices a leak
- Leak detection is off until you switch it on, in Aliases › Leak detection.
- You name the company when you make the alias, or confirm the first sender Kuuko sees.
- Mail from another sender still reaches you, with a warning line at the top.
- The app shows it on the alias, with how many mails came from someone else, and with a notification when you open Kuuko.
- With automatic pause, the alias switches off after that mail.
What it can’t do
- A company that writes from a domain you didn’t name causes a false warning. Add that domain to the alias.
- A leak by the company itself, such as its own data breach, isn’t noticed: the mail still comes from its domain.
- Aliases that accept any name before the @ are left out.
The ledger
- Note for each alias what you shared with whom, when and why.
- It’s encrypted with a key made from your 12 words. Kuuko’s server keeps only a copy it can’t read, so your iPhone and Mac stay in step.
Sources
- Kuuko support page · opened 28 October 2026