Filter to external program like thunderbird

Recently moved to emClient from Thunderbird. Am loving it. Previously I was using a filter addon on TB called FiltaQuilla. With that utility there is a Filter action of “run a program”. I had set it up to run: http://www.growlforwindows.com/gfw/he… and all was good… I was passing over the subject line, plus first 150 characters of the body… How can I do that with emClient ???