domain report
Is 1-3-3-7.net a disposable email?
Yes. 1-3-3-7.net is a disposable email domain: a throwaway inbox service.
Disposable inbox — it will stop receiving mail soon.
- category
- disposable
- recommendation
- block
- confidence
- 97%
- Google Workspace: not detected
- Microsoft 365: not detected
Mail setup
- Receives mail
- Yes
- Mail provider
- —
- SPF
- —
- DMARC policy
- None
| Priority | MX host |
|---|---|
| 10 | mx6.4-speed.net |
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 97% · recommendation block under the default b2b policy.
What this means
Addresses at 1-3-3-7.net are created in seconds without sign-up and are usually abandoned soon after. They are used to get past email verification, claim free trials more than once or avoid follow-up email. It is on our disposable email domains list.
isBusinessEmail returns category "disposable" and recommends block under every policy (b2b, strict and lenient). 1-3-3-7.net receives mail through mx6.4-speed.net.
Questions about 1-3-3-7.net
Is 1-3-3-7.net a disposable email domain?
Yes. 1-3-3-7.net is on the isBusinessEmail disposable list, so a check returns category "disposable" and the recommendation "block".
Should I block 1-3-3-7.net at sign-up?
For most products, yes: a disposable inbox stops receiving mail soon, so you can't reach the user later. isBusinessEmail recommends block under all three policies.
Can 1-3-3-7.net receive email?
1-3-3-7.net receives mail through mx6.4-speed.net.
How do I detect addresses like 1-3-3-7.net automatically?
Call POST /v1/check with the address or domain. Disposable domains come back with is_disposable: true, from a list merged from open sources and our own detection and updated daily.