Is uni.sydney.edu.au valid?

Domain: uni.sydney.edu.au

Valid: Yes

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

Tested MX: au-smtp-inbound-1.mimecast.com (103.96.22.26)

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Using MX pointer au-smtp-inbound-1.mimecast.com from DNS with priority: 10

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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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