Is a21.ai valid?

Domain: a21.ai

Valid: Yes

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

Tested MX: a21-ai.mail.protection.outlook.com (52.101.144.0)

Using MX pointer a21-ai.mail.protection.outlook.com from DNS with priority: 0

DO NOT SCRAPE THIS DATA, USE THE API

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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