applescript apple mail add-on

need a preferably applescript apple mail add-on (osx 10.10) reachable from mail menu or with other easy access from mail app, with the following function: -textbox for base email folder path, default value stored -textbox to enter a variable, button -creates a (smtp) mailbox under base email folder path/ 'variable' -sets up a rule to auto move emails containing the base email folder path/ 'variable' code needs to be transparent and reviewable