Support for multiple SSL certifications in Zimbra for all protocols

I’m pleased to announce that our Zimbra service now supports multiple SSL certificates for all protocols (except SMTP – coming soon!). This is something that cannot be done with a standard Zimbra installation.

For our resellers who currently have their own SSL certificate installed for the Zimbra UI, we’ve added POP3S and IMAPS support using the same certificate and hostname.

For those interested in the technical side of how this was accomplished; we’ve modified our frontend lvs cluster servers with Zimbra versions of nginx, set to use additional nginx config files for each reseller. Nginx talks to our Zimbra servers so that it can direct any incoming connection to the correct backend Zimbra server hosting the mailbox being requested.These lookups are cached using the supplied memcache.