Is gwu.edu valid?

Domain: gwu.edu

Valid: Yes

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

Tested MX: mailprdfbdmz5-mx.es.gwu.edu (128.164.45.53)

Using MX pointer mailprdfbdmz5-mx.es.gwu.edu 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:

No anomaly detected

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