I 'm using potfix-dovcote as an internal mail server(local.myco.com) and wan to run another potfix-dovcote as an external mail server (myco.com) on Internet.75% of my users should only work internally(no external mail) but the rest of users (25%)should be able to send mail to external network! These users have the same username on myco.com. I use smtp_generic_maps to map int username of these users to ext. one. For eg. All email send by test@local.myco.com map to test@myco.com. So anyone got these mails can reply them. I know that getmail is the tools that can get mails from users external mailbox and put them into int. mailbox.

1. I have a root access to ext mail server. But do not know my ext user password!. How can I use getmail to move ext mail to internal one?!
2. What is your idea about syncing users password in internal/external mail server?! I think its needed for getmail!
3. How can I restrict my internal users to send mail only internally!?

I appreciated any help!!

TNX