Is gvozdkov.ru valid?

Domain: gvozdkov.ru

Valid: Yes, but should be blocked

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

Tested MX: mmxs.majordomo.ru (78.108.80.147)

Using MX pointer mmxs.majordomo.ru from DNS with priority: 10

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:

Heuristics: BM1

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