Zimbra as a backup mail server
Hi, i'm new about Zimbra and i'm going to consider the possibility to inastall it for my comapany.
We have about 30 mail account managed by our external provider and we don't want to replace the mail server of the provider with Zimbra.
And so, we would like to have our internal mail server (zimbra) and access it by IMAP, so we can easily make a backup af all the mail.
And so the Zimbra server need to comunicate only with the mail server of the provider and download the mail in order to make it available for the internal clients.
This is not a standard configuration, Is it possible?
How the zimbra server can communicate with the official mail server of the provider? via POP? or SMTP?