Is mytahoo.com valid?

Domain: mytahoo.com

Valid: Yes, but should be blocked

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

Tested MX: aero4.externalemail.com (165.22.196.27)

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Using MX pointer aero4.externalemail.com from DNS with priority: 0

Block: Yes

You should 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: BM1

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