I have a zimbra open source edition. I wish to install a backup server in another location. I also intend to add an MX record with a lower priority to the standby server. My goal is to have emails routed to this standby sever if my main server is to go down. But my concerns are
# If my server comes back up, will it sync with the standby for the emails routed to it automatically.
#How will users access their mails for the period it is down since the mail.domain.com points to the main server.
Hoping on you guys input