Is cto.de valid?

Domain: cto.de

Valid: Yes

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

Tested MX: cto-de.mail.protection.outlook.com (52.101.68.21)

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Using MX pointer cto-de.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.

Raw API reason:

Heuristics: WM1

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