Auot reply with diff.subjects header

Hi Folks

Is there any software which can let me auto reply to the mails by
attaching the respctive file to it. I want to sort the mails by subject
name and then according to the subject i want to send a reply. I have used
procmail but it does not have this facility. Another software i have is
ftpmail. Is there any other software for this. 

Thanx in advance

prabodh