Is mss-association.org valid?

Domain: mss-association.org

Valid: Yes

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

Tested MX: a.smtp.mail.smithbucklin.com (38.106.217.191)

Using MX pointer a.smtp.mail.smithbucklin.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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