Is sp2.ustka.pl valid?

Domain: sp2.ustka.pl

Valid: Yes, but should be blocked

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

Tested MX: sp2.ustka.pl (194.181.228.55)

USE THE API, DO NOT SCRAPE THIS DATA

Using MX pointer sp2.ustka.pl from DNS with priority: 1

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:

Anomalies detected

START USING FREE API