Is vanguardac.net valid?

Domain: vanguardac.net

Valid: Yes

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

Tested MX: ussf55.upstreamsecurity.net (38.99.86.55)

Using MX pointer ussf55.upstreamsecurity.net from DNS with priority: 1

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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:

Heuristics: WM1

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