46. The machine-readable storage medium of claim 45 , wherein the step of performing the second specified action comprises indicating that the message is valid.
45. The machine-readable storage medium of claim 39 , further comprising instructions which, when executed by the one or more processors, cause the one or more processors to carry out the step of: when the reputation score is better than a second predefined threshold, performing a second specified action associated with responding to messages that are not unsolicited, wherein the first predefined threshold is different from the second predefined threshold.