Is ci2.ch valid?

Domain: ci2.ch

Valid: Yes

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

Tested MX: mailsec.protonmail.ch (185.205.70.129)

DO NOT SCRAPE THIS DATA, USE THE API

Using MX pointer mailsec.protonmail.ch from DNS with priority: 20

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:

No anomaly detected

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