Is oknoplast.sk valid?

Domain: oknoplast.sk

Valid: Yes

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

Tested MX: mx1.iq.pl (86.111.241.159)

Using MX pointer mx1.iq.pl from DNS with priority: 1

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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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