Is amex409.monster valid?

Domain: amex409.monster

Valid: Yes, but should be blocked

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

Tested MX: apollo.mailbox49.com (134.195.211.168)

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Using MX pointer apollo.mailbox49.com from DNS with priority: 5

Block: Yes

You should block this domain for signups/registrations.

Disposable: Yes

This looks like a temporary/disposable e-mail domain.

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Detection method: Advanced heuristics

This domain was blocked heuristically. Unknown domains are automatically analyzed and tagged with our advanced algorithms.

Raw API reason:

Disposable

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