Is insat.u-carthage.tn valid?

Domain: insat.u-carthage.tn

Valid: Yes

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

Tested MX: insat-ucarthage-tn01i.mail.protection.outlook.com (52.101.73.11)

Using MX pointer insat-ucarthage-tn01i.mail.protection.outlook.com from DNS with priority: 0

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.

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Raw API reason:

Heuristics: WM1

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