Is peak.uk.net valid?

Domain: peak.uk.net

Valid: Yes, but should be blocked

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

Tested MX: peak-uk-net.mail.protection.outlook.com (52.101.68.8)

Using MX pointer peak-uk-net.mail.protection.outlook.com from DNS with priority: 0

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:

Anomalies detected

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