Is mad.scientist.com valid?

Domain: mad.scientist.com

Valid: Yes

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

Tested MX: mad.scientist.com (108.138.106.83)

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

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:

Some anomalies detected

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