Is stu.ocsb.ca valid?

Domain: stu.ocsb.ca

Valid: Yes

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

Tested MX: stu.ocsb.ca (142.251.168.27)

No MX-pointer in DNS record. Using domain: stu.ocsb.ca

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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