Is xl5.co.uk valid?

Domain: xl5.co.uk

Valid: Yes, but should be blocked

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

Tested MX: inboundcluster1.giacomcp.com (185.145.48.171)

Using MX pointer inboundcluster1.giacomcp.com from DNS with priority: 10

Block: Yes

You should block this domain for signups/registrations.

Disposable: No

This does not look like a temporary/disposable e-mail domain.

Raw API reason:

Heuristics: T1

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