To alternate the background color of rows in an HTML table using AMPscript, the MOD function can be used to determine if the row number is odd or even.

MOD Function: The MOD function returns the remainder of a division operation. By using MOD(@numerator, 2), the function returns 1 for odd rows and 0 for even rows, allowing the background color to be set accordingly.

AMPscript Example:

%%[ SET @numerator = 1 FOR @i = 1 TO RowCount(@rows) DO SET @color = IF MOD(@numerator, 2) == 1 THEN 'Red' ELSE 'White' ENDIF SET @numerator = ADD(@numerator, 1) ]%% %%[ NEXT @i ]%%

Salesforce AMPscript Functions