Is kk-grp.jp valid?

Domain: kk-grp.jp

Valid: Yes

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

Tested MX: mx.securemx.jp (210.130.202.96)

Using MX pointer mx.securemx.jp 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:

USE THE API, DO NOT SCRAPE THIS DATA

Heuristics: WM1

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