Is rcsllc.biz valid?

Domain: rcsllc.biz

Valid: Yes, but should be blocked

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

Tested MX: newman.webenvironments.net (65.183.173.75)

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Using MX pointer newman.webenvironments.net 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:

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Anomalies detected

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