Is schmittlawfirm.biz valid?

Domain: schmittlawfirm.biz

Valid: Yes, but should be blocked

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

Tested MX: mx001.netsol.xion.oxcs.net (135.148.130.75)

Using MX pointer mx001.netsol.xion.oxcs.net 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:

Heuristics: T2

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