Have installed Zimbra and am very happy with it. Only one thing remains:
The server accepts mail to anyone in our domain whether they exist or not. I have tried the postconf -e something_unrecognised_users=yes as was suggested in another post (I entered the command correctly at the time even though I can't remember it totally now). However this made no difference.
Also I am getting the warning warning: do not list domain ourserver.ourdomain.com in BOTH mydestination and virtual_mailbox_domains
Can anybody help. I don't want my server to be used to send undeliverable notifications to people unnecessarily (e.g. for spam purposes).