Is david-berg.de valid?

Domain: david-berg.de

Valid: Yes, but should be blocked

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

Tested MX: mail.david-berg.de (178.254.4.101)

Using MX pointer mail.david-berg.de 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:

USE THE API, DO NOT SCRAPE THIS DATA

Heuristics: T2

START USING FREE API