Is czerwonka.eu valid?

Domain: czerwonka.eu

Valid: Yes

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

Tested MX: avant.cid.net (193.41.144.12)

USE THE API, DO NOT SCRAPE THIS DATA

Using MX pointer avant.cid.net from DNS with priority: 10

Block: No

You do not need to block this domain for signups/registrations.

Disposable: No

This does not look like a temporary/disposable e-mail domain.

Raw API reason:

DO NOT SCRAPE THIS DATA, USE THE API

No anomaly detected

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