Is kalixnd.org valid?

Domain: kalixnd.org

Valid: Yes

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

Tested MX: cloud11.spamtitan.com (3.19.87.175)

Using MX pointer cloud11.spamtitan.com from DNS with priority: 5

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:

Heuristics: WM1

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