The interactive gateway system for countering spam is a general interactive mechanism for countering various inter-domain spam messages, including e-mail spam, SMS spam, etc., to enable information sharing for countering spam among different domains, and to prevent spam from being sent as well as from being received. This Recommendation supports the diversity of spam-countering filtering techniques, and offers flexibility for upcoming techniques. Compliance with all relevant national laws and regulations should be considered before adopting this Recommendation.