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False positive rate with filtering

What is the false positive rate of your spam filter?   2 members have voted

  1. 1. What is the false positive rate of your spam filter?

    • less than 0.01%
    • between 0.01% and 0.1%
    • between 0.1% and 1%
    • between 1% and 3%
    • bewteen 3% and 5%
    • greater than 5%
    • I don't keep track of false positives

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1 post in this topic

False positives are situations where the spam filter classified a good email (ham) as spam. They are calculated using the following formula


no of good emails classified as spam / total number of good emails.


E.g. if Your mail filter classified 100 emails as 90 spam and 10 good and of the 90 classified as spam, 2 are good, your false positive rate = 2/10 *100% = 2%


This is an important measure because it measures are likely you are to wrongly junk a good email. If you have a false positive rate of 2% it means if you trust the filter fully, and don't trust for mistakes, you will lose 2 good emails wrongly classified as junk spam out of every 100 good emails.

Edited by Paranoid

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