Procmail question...

Hi,

   I have this problem when using procmail.
         procmail: Executing "formail,-xSubject:"
         /bin/sh: formail: cannot open
         procmail: Assigning "SUBJECT="
         procmail: Executing "formail,-rx,To:"
         /bin/sh: formail: cannot open

   These error is in the procmail.log file

   Please give me some hints of how I could have done it wrong

Thank you very much,
Thao Nguyen