Is 37signals.com valid?

Domain: 37signals.com

Valid: Yes

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

Tested MX: work-mx.app.hey.com (64.202.125.68)

Using MX pointer work-mx.app.hey.com 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.

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Raw API reason:

Heuristics: WM1

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