Using a DMZ for email?

[Anthony Hologounis]

Hello


I set up a DMZ to run http, smtp and ftp services external to my private 
network. Http and ftp seem to be pretty simple. I have some questions 
about SMTP.

I have postfix running on the DMZ machine and it gets all of the mail 
external to me. My private/protected network has a mail server that I 
use to send mail. The INTERNAL network can pop/imap the mail from the 
DMZ machine but in order for me to do this the DMZ machine has to have 
the user name and password. This seems to be a security risk not to 
mention extra administration. I have to create users twice to make this 
work.

Is there a better way to do this?

-- 
Anthony Hologounis