Is captialone.com valid?

Domain: captialone.com

Valid: Yes

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

Tested MX: captialone.com (199.244.214.70)

No MX-pointer in DNS record. Using domain: captialone.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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