Recommendation ITU-T X.1240 specifies basic concepts, characteristics and effects of e-mail spam, and technologies involved in countering e-mail spam. It also introduces the current technical solutions and related activities from various standards development organizations and relevant organizations on countering e-mail spam. It provides guidelines and information to users who want to develop technical solutions on countering e-mail spam. This Recommendation will be used as a basis for further development of technical Recommendations on countering e-mail spam.