Is sirweb.org valid?

Domain: sirweb.org

Valid: Yes

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

Tested MX: us-smtp-inbound-2.mimecast.com (170.10.128.242)

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Using MX pointer us-smtp-inbound-2.mimecast.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.

Raw API reason:

Heuristics: WM1

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