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I'm wondering if perhaps there's a way to disable logins via the web interface, while continuing to allow IMAP/POP access. I see options to enable/disable logins via POP and IMAP, but none for the web.
The idea here is that I'd like to provide different classes of service for hosted users. At the lowest end, there would only be POP and IMAP access.
I'm currently using the OSS Zimbra 3.0.1 on CentOS.
No way to turn it off completely today, but you can cripple it and turn off all the advanced features like contacts, tags, calendars, search folders, zimlets, etc. So they'd have a very minimal web client available to them.
obviously this disables a huge part of what's cool about zimbra but hey you could do this to prevent the server from even listening on the http/s ports:
zmprov ms SERVERNAME zimbraMailPort 0 zimbraMailSSLPort 0
tomcat restart
if you file that bug you might suggest adding a zimbraMailMode: none
Bugzilla
Wiki
Source
Disable Web Interface 
but hey you could do this to prevent the server from even listening on the http/s ports:
Linear Mode
