Is shastacorp.comcastbiz.net valid?

Domain: shastacorp.comcastbiz.net

Valid: Yes, but should be blocked

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

Tested MX: shastacorp-comcastbiz-net.mail.protection.outlook.com (52.101.11.2)

Using MX pointer shastacorp-comcastbiz-net.mail.protection.outlook.com from DNS with priority: 1

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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