Is 11-inbox.com valid?

Domain: 11-inbox.com

Valid: Yes, but should be blocked

This domain is valid and should be able to receive e-mail.

Tested MX: mx.disposable-mail.org (5.161.114.221)

Using MX pointer mx.disposable-mail.org from DNS with priority: 10

Block: Yes

You should block this domain for signups/registrations.

Disposable: No

This does not look like a temporary/disposable e-mail domain.

Raw API reason:

Heuristics: T3

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