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Detection of popular webmail HAMY (Hotmail, AOL, MSN, Yahoo) and other top provider intelligence honeypots designed as an internal network defense system to detect level of engagement.
Email addresses are not permanent. When there has been no login activity for a long period of time, the recipient account is defined by the provider as “inactive” and turned into a form of unknowing collaborator with no non-delivery report (NDR) indicating “no such user” or “mailbox not found” being sent as a response. Thus any email sent during this period of time before account deactivation is assumed, in the collective, as spam and its email signature mapped and used to block any email to other active recipient accounts within the domain.
