# Advanced Statistical Filtering

These options control the underlying functionality of the statistical filtering feature, and are dependant upon each other to effectively identify spam. If you have a significant number of legitimate messages that are being identified as spam or vice versa, you may need to adjust these options.

Note: The default settings are appropriate for most systems. It is strongly advised that ONLY experienced administrators modify these settings. Setting these options too high or too low will hinder the ability of IMail Server to identify spam.

To adjust these options, make any desired changes and click Save.

- Probability a new word is spam (percent). The probability percentage by which new words are measured to determine if they are spam. Enter any percentage between 0 and 100%. The default is 40%. Example

- An email is spam when its calculated probability exceeds (percent). Specify the minimum probability at which an e-mail is identified as spam. Each e-mail has a probability assigned to it based on the combined value of each word within it (spam vs non-spam). This option sets the minimum probability at which a message will be identified as spam. Messages with probability values below this value, will be favored as non-spam. Messages with probability values above this value will be favored as spam. Enter a value between 0 and 100%. The default is 90%. Example

- Maximum Number of words to use in calculating an email's probability. The number of individual word values used to calculate the probability that an e-mail is spam. You can enter any value in this text box, however, anything over 25 may have unpredictable results. The default is 15.

Related Topics:

Statistical Filtering