Is nxtmark.com valid?

Domain: nxtmark.com

Valid: Yes, but should be blocked

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

Tested MX: nxtmark.com (66.81.203.198)

No MX-pointer in DNS record. Using domain: nxtmark.com

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:

USE THE API, DO NOT SCRAPE THIS DATA

Heuristics: T2

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