Is firmus-wib.de valid?

Domain: firmus-wib.de

Valid: Yes

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

Tested MX: mail.firmus-wib.de (79.140.189.75)

Using MX pointer mail.firmus-wib.de from DNS with priority: 20

Block: No

You do not need to block this domain for signups/registrations.

Disposable: No

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

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Raw API reason:

DO NOT SCRAPE THIS DATA, USE THE API

No anomaly detected

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