Is bit64.com.ar valid?

Domain: bit64.com.ar

Valid: Yes

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

Tested MX: am82.mesi.com.ar (181.225.136.82)

Using MX pointer am82.mesi.com.ar from DNS with priority: 10

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

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