======Spam Filter Rules: Assignments======
You can assign values to variables using the syntax
<code>
${variable} = value | ${variable}
</code>

=====Assignment operators=====
The spam filter rules support the following assignment operators:
^=  |Specify the value of the variable to equal the value after the assignment operator |
^+=  |Add the numeric value after the assignment operator to the current numeric value of the variable |
^-=  |Subtract the numeric value after the assignment operator from the current numeric value of the variable |
^*=  |Multiply the current numeric value of the variable by the numeric value after the assignment operator |
^/=  |Divide the current numeric value of the variable by the numeric value after the assignment operator |
^.=  |Concatenate the text after the assignment operator onto the current value of the variable |

  * There must be a space on each side of the assignment operator
  * On the right side of the assignment operator you can specify text or variables. 


=====Functions=====
There are various 'operators' or 'functions' which you can specify on the right side of the assignment operator:

^ Function name ^ Description ^ Version ^
^CalcBayes  |Makes VPOP3 calculate the statistical probability of the current message being spam based on the current Bayesian database contents. This is returned as a percentage probability between 0 (not spam) and 100 (spam). |2.1.7+ |
^GetDateNow  |Returns the current date as the number of days since 1st January 1601 (in UTC time) |2.2.1+ |
^ABS  |Returns the absolute value of the following value <code>${x} = ABS -3</code> would make ${x} = 3 |2.2.1+ |
^CEIL  |Returns the smallest integer value which is greater than or equal to the following value (CEIL 3.1 = 4, CEIL -3.1 = -3) |2.2.1+ |
^FLOOR  |Returns the largest integer value which is smaller than or equal to the following value (FLOOR 3.1 = 3, FLOOR -3.1 = -4) |2.2.1+ |
^INT  |Returns the following value with any fractional part truncated (INT 3.1 = 3, INT -3.1 = -3) |2.2.1+ |
^LENGTH  |Returns the length in characters of the following value (LENGTH "hello" = 5) |2.3.7+ |