Is khh.pl valid?

Domain: khh.pl

Valid: Yes, but should be blocked

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

Tested MX: blackhole.aftermarket.pl (185.253.212.68)

USE THE API, DO NOT SCRAPE THIS DATA

Using MX pointer blackhole.aftermarket.pl 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:

DO NOT SCRAPE THIS DATA, USE THE API

Heuristics: BM1

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