We are in the final process of evaluating Zimbra.
We are going to have 13 servers located around the world.
- One server will be Mailbox, LDAP Master and MTA server
- One server will be Mailbox and MTA server
- All other servers will be "Mailbox Only" servers (i.e, they will send mail through the two MTA's).
(any remarks will be greatly appreciated in case this approach is wrong...)
All servers will be behind NAT and only the two MTA's will have public IP's (also behind NAT).
We would like users in the "Mailbox Only" servers to access WebMail when out of the office, but we don't want to assign a public IP for every server (for security reasons). Only the MTA servers should have public IP's.
If possible, we would like "Mailbox Only" server users to access their WebMail through one of the MTA servers, since we want only the MTA servers to have a public IP.
At the moment, when a user of a "Mailbox Only" server types the MTA's public FQDN in the address bar, he/she is confronted with the login page, which is fine. But when they login they are redirected to their mailbox server's WebMail page. Since that server has no public IP they get a blank page.
Can Zimbra serve as a "WebMail proxy" and allow "Mailbox Only" server users to connect from the outside through another server which does have a public IP?
(hope I didn't cause too much confusion )