http://wiki.zimbra.com/wiki/Zmmailbox

http://wiki.zimbra.com/wiki/Zmprov_Examples

http://wiki.zimbra.com/wiki/Administration_Console_and_CLI_Certificate_Tools

First, you might want to move all folders you want to delete, then run the following command on “/Trash”.

zmmailbox -z -m admin@domain.com emptyFolder /foldernamelikeInbox

The above command may be less dangerous to use, but may be a little more work.

Lightly tested - Throws a couple of errors, but seems to work OK.

export ACCOUNT="username@mydomain.com"
for FOLDER in `zmmailbox -z -m $ACCOUNT gaf |awk '/\// {print $5}'|sort|uniq` ; do zmmailbox -z -m $ACCOUNT emptyFolder $FOLDER ; done
unset ACCOUNT

https://dilliganesh.wordpress.com/2014/03/23/list-out-all-account-in-zimbra/

su - zimbra
zmprov -l gaa |grep -v -e galsync -e spam -e ham -e virus > /tmp/zimbra_users.txt