Is redbymail.com valid?

Domain: redbymail.com

Valid: Yes, but should be blocked

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

Tested MX: mx.yandex.net (77.88.21.249)

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Using MX pointer mx.yandex.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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