Is sandmail.cf valid?

Domain: sandmail.cf

Valid: Yes, but should be blocked

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

Tested MX: sandmail.cf (195.20.51.20)

No MX-pointer in DNS record. Using domain: sandmail.cf

Block: Yes

You should 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:

Anomalies detected

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