(smartlist) cal.alumni -exec permissions for sendmail.-

Hi everyone, I hope that someone might have time to answer a probably quick question. I read the entire faq and didnt see anything in there. Well here goes. here's the error message that I'm getting. ----- The following addresses had permanent fatal errors ----- "|exec /home/list/.bin/flist jackl-test" (expanded from: <jackl-test@sum.alumni.somwhere.edu>) ----- Transcript of session follows ----- sh: exec not available for sendmail programs 554 "|exec /home/list/.bin/flist jackl-test"... Service unavailable