domain report
What kind of email address is duck.com?
duck.com is an email relay: a privacy service that forwards mail to a hidden personal inbox.
Relay address that forwards to a hidden inbox.
- category
- relay
- recommendation
- block
- confidence
- 98%
- Google Workspace: not detected
- Microsoft 365: not detected
Mail setup
- Receives mail
- Yes
- Mail provider
- —
- SPF
- v=spf1 ip4:20.13.235.192/26 ip4:20.67.221.0/24 ip4:20.67.222.0/24 ip4:20.67.223.0/24 ip4:50.85.11.0/24 ip4:50.85.12.0/24 ip4:50.85.10.0/24 ip4:20.67.143.55 -all
- DMARC policy
- quarantine
| Priority | MX host |
|---|---|
| 5 | smtp-inbound1.duck.com |
Workspace
- Google WorkspaceNot detected
- Microsoft 365Not detected
Detected per company domain from public DNS and Microsoft's documented tenant discovery — never per person.
Why this verdict
Confidence 98% · recommendation block under the default b2b policy.
What this means
Relay addresses at duck.com keep working and reach a real person, but the address is created to hide their actual inbox, and they can switch it off at any time. It tells you nothing about the company they work for.
isBusinessEmail returns category "relay": block under b2b and strict, allow under lenient. duck.com receives mail through smtp-inbound1.duck.com.
Questions about duck.com
Is duck.com a disposable email?
Not exactly. duck.com forwards to a real inbox that keeps working, but the user can turn the alias off. isBusinessEmail reports it separately as "relay".
Should I block duck.com at sign-up?
Consumer products usually accept relays. B2B products that need a company address treat them like personal email; the b2b policy recommends block.
Is duck.com a business email?
No. A relay hides the person's real address, so it can't show which company they work for.