Looking for variation on Mail script
 

I used Entourage for my work and interaction with my colleagues, but Mail for personal communications. The MailAction script works for me, but I need to add "--" to the subject line of any message before I forward a task to Mail for subsequent addition to OF. However, I would like to be able to have a rule that will forward items to OF if they come from a specific mailbox (I created a gmail account specifically for that purpose). I assumed that by modifying the Mail rule to include a filter that looks for the address it trigger the script. I notice that some kind of activity takes place when such a message arrives in Mail, but the handoff to OF is not made. Is the script hardcoded for the character combination (e.g., "--")? Can the script be modified to permit what I am trying to do?
Thanks