Is martin-on-line.de valid?

Domain: martin-on-line.de

Valid: Yes

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

Tested MX: mx01.ionos.de (217.72.192.67)

Using MX pointer mx01.ionos.de from DNS with priority: 10

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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.

Raw API reason:

Some anomalies detected

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