Spam Filter Rules: Assignments

You can assign values to variables using the syntax

${variable} = value | ${variable}

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 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 ${x} = ABS -3 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+