Is 437gmail.com valid?

Domain: 437gmail.com

Valid: Yes, but should be blocked

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

Tested MX: em4.recoverhost.com (159.223.152.98)

Using MX pointer em4.recoverhost.com from DNS with priority: 10

Block: Yes

You should block this domain for signups/registrations.

Disposable: Yes

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

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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