Is xt4.co.uk valid?

Domain: xt4.co.uk

Valid: Yes

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

Tested MX: mx.xt4.co.uk.cust.a.hostedemail.com (216.40.42.4)

Using MX pointer mx.xt4.co.uk.cust.a.hostedemail.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:

USE THE API, DO NOT SCRAPE THIS DATA

Heuristics: WM1

START USING FREE API