[SOLVED] Proxmox - Exchange integration

PMG is intended to be part of the server<->server communication. It does not handle any access of clients to their mailboxes via protocols like IMAP,POP3,MAPI,EAS,….
 
PMG is intended to be part of the server<->server communication. It does not handle any access of clients to their mailboxes via protocols like IMAP,POP3,MAPI,EAS,….
so there is a proxmox proxy to expose the ports for imap?
 
Someone else might have some ideas on how to protect an Exchange server.
A VPN would probably be the safest approach, but also cumbersome for the end-users. Otherwise, you will have to expose the web interface, IMAP, EAS and whatever client protocol you need, to the internet in some way more or less direct for them to be able to use it.