How does PureMessage flag potential spam?
PureMessage adds “spam?#” at the beginning of the subject line for messages with greater than 50% probability of being spam. This makes it easy to identiy potential spam. Multiple “#” characters are inserted as the spam probability increases. For example, a spam probability over 50% receives one #; over 60% probability receives two #s; and so forth. Additional headers are included in messages with a greater than 20% probability of being spam. These headers provide more detail about the spam content as well as allow a greater degree of filtering. The spam headers can provide some hints as to why a given message was marked as spam.
