Is i3s.up.pt valid?

Domain: i3s.up.pt

Valid: Yes

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

Tested MX: mailrelay.i3s.up.pt (193.137.38.131)

Using MX pointer mailrelay.i3s.up.pt from DNS with priority: 10

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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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