Normally you have the MTA - postfix in the DMZ. But you do not store user mail boxes on it, for security reasons. User mailboxes should be in LAN as you have planned. You may be doing Virus scanning, on the emails as they pass (there's a FOSS virus scanner (clamavi IIRC) but I've not used it).

Don't the Windows machine have something like an Exchange server? In that case you just route the user email on to it.

If there isn't an exchange server, then you need another box, and have them using POP or IMAP to read their mail and download it onto whatever file server, the Windows clients are using.

If you're lucky and they don't have exchange, there's some FOSS replacements, that ought to give enough gee-whiz features, to keep the EVIL that is Exchange at bay. If you're storing files over network via something like NFS, be sure to soak test the file locking, that's always been a problem area, for implementations.

Message Edited by RobRunsLinux on 12-17-2007 05:00 PM

Thanks for the response. I think that I have found the answer. Due to the fact the everyone is using outlook I will just relocate the inbox.pst file to the drive that they have on the powervault. That way outlook can handle the writing and reading etc... If this does not sound reasonable then please let me know. thanks.

Is the Outlook connecting to an Exchange server (usually they have that).

If your MTA is writing to inbox.pst on the Power Vault, you have the problem, that any break-in to your externally accessible machine, means your firms internal email is "owned" by the l33t hacker, ok. You get fired.

So make sure you are passing the email to a server in the LAN, that is not externally accessible, so you can say you had a firewall.