Hello,
I've just installed the newest grommunio from ISO + I did an update.
Seems there is an typo in grommunio-setup (setup.sh), line 856 and 864

which results that postfix complains (grommunio-virtual-mailbox-maps.cf doesn't exist) and emails are bounced with info - user doesn't exist.
Line 864 should write to: grommunio-virtual-mailbox-maps.cf