 ports
10024 is open for amavis. And, now that you mention it, you'll have to use something other than 10025 - you'll notice in master.cf (in /opt/zimbra/postfix/conf) a line starting 127.0.0.1:10025 - this is the port on which amavis submits scanned mail back to postfix - so postfix is probably choking on opening the same port twice.
Try 11025 instead. |