Is sendmail.cz valid?

Domain: sendmail.cz

Valid: Yes

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

Tested MX: da3f1f149f1a1a419884df140a82c5.pamx1.hotmail.com (52.101.10.19)

Using MX pointer da3f1f149f1a1a419884df140a82c5.pamx1.hotmail.com from DNS with priority: 10

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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