Is yahoo.deweb.de valid?

Domain: yahoo.deweb.de

Valid: Yes, but should be blocked

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

Tested MX: mx156.hostedmxserver.com (164.90.197.162)

Using MX pointer mx156.hostedmxserver.com 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.

DO NOT SCRAPE THIS DATA, USE THE API

Raw API reason:

USE THE API, DO NOT SCRAPE THIS DATA

Heuristics: BM1

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