[Dovecot] Proxy using passd file

[Clayton Epp]

I'm trying to create a proxy using passwd files. Can I use the existing
passwd files created by the system (ie passwd and shadow) or do I have
to create new passwd files for the email proxy users? How would the
passwd and shadow files for a proxy using passwd files look? I've tried
the example on the wiki but I'm not getting anywhere, pop and imap
requests are not getting sent to the other server.