How to block portlandpowder.com invalid e-mail domain
This domain is valid and should be able to receive e-mail.
Using MX pointer portlandpowder-com.mail.protection.outlook.com from DNS with priority: 0
You should block this domain for signups/registrations.
This does not look like a temporary/disposable e-mail domain.
Anomalies detected
DOMAIN RISK: 99
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