Are you trying to set up a fetchmail script that will collect mail from one external mailbox and then deliver to each of the recipients linux accounts ?
If so, I can help - if not I can try .....
I have a multi-collect fetchmail script that collects mail from one specific external pop box. It then reads the name before the @ sign and delivers to the appropriate linux account.
you would need to make sure you have your sendmail configured too - particularly aliases. If you don't know what this means, I can explain it. You might not even be using sendmail - maybe procmail.
Basically, if you are trying to achieve what I am running, then I can let you know what I did.