Ok, I have a lot of experience with sendmail, but the postfix/zimbra mta is all new to me. We have a mailfoundry appliance, and I've disabled anti-spam/anti-virus on the zimbra service (for load reasons). The mailfoundry auto-learns what domain to forward to smtp destination IP's that I specify for it, this worked fine with sendmail, however my zimbra/postfix is apparently not responding properly when the mailfoundry ask it if it host the domain, it appears to the mailfoundry that zimbra accepts the domain. The mailfoundry then adds the domain automatically to the smtp host, this is bad. Is there any way to change this behavior, so Zimbra only accepts mail for domains it actually host?