| Specification | Observed behavior | Boundary | State |
|---|---|---|---|
| Sender device | Seals mail to another Unlike Mail user before delivery. | Ordinary mail is outside this scope. | Confirmed |
| Recipient device | Opens sealed mail with local key material. | Device compromise and key verification are not evaluated here. | Confirmed |
| Public-key directory | Looks up the recipient key by email before sealing. | Trust on first use; transparency and fingerprint verification are not published. | Confirmed |
| Mailbox provider | Carries sealed mail between enrolled users. | Handling outside the sealed payload is not characterized here. | Confirmed |
| Web session | Holds a usable provider credential in memory while signed in. | Live-session boundary; avoid blanket zero-knowledge wording. | Confirmed |
| Native client | Android and Windows use credentials in device secure storage. | Native handling differs from the web session. | Confirmed |
Unlike Mail
Messages between Unlike Mail users are sealed on the sending device; provider, session and recovery limits follow.
Custody boundaries
Recovery and limits
| Specification | Behavior | Limit | State |
|---|---|---|---|
| Another enrolled device | Recovery path published. | Exact flow is not specified here. | Confirmed |
| Lost passphrase and all devices | No recovery path. | No master-key restoration. | Confirmed |
| Recipient outside Unlike Mail | Sent as ordinary email. | Sealing does not apply. | Confirmed |
| IMAP / SMTP bridging | Not offered. | No compatibility claim. | Not offered |
| Custom-domain support | Not offered. | No compatibility claim. | Not offered |
| Other mailbox providers | Not offered. | Named providers do not imply wider support. | Not offered |
Security evidence
Recipient discovery
The email-to-public-key directory uses trust on first use; transparency and fingerprint verification are not published.
Confirmed
SOURCE / Unlike Mail product brief / Recipient key discovery
Web-session boundary
A provider credential is usable in web-session memory while signed in.
Confirmed
SOURCE / Unlike Mail product brief / Security
Native-client boundary
Android and Windows keep provider credentials in device secure storage.
Confirmed
SOURCE / Unlike Mail product brief / Security
Cryptographic family
A post-quantum KEM seals messages; parameter identifiers are not published here.
Confirmed
SOURCE / Unlike Mail product brief / Security
Independent review
No third-party security assessment is listed in the available evidence.
Pending
SOURCE / Information needed / item 18
Published pricing
- Published monthly price
- $1.50/mo
- Confirmed
- Published annual price
- $15/year
- Confirmed
- Published trial
- 30-day trial
- Confirmed
Commercial limits
- Checkout
- Pending verification; published price is not live-billing evidence.
- Pending
- Currency, tax and jurisdiction
- Not published in the available evidence.
- Pending
- Team pricing
- Not stated here.
- Pending