Hello... need to run an open relay in my internal network so everyone with an ip in my three or more subnets must be allowed to send email through zimbra´s postfix. These users are not users in zimbra and they can not auth to zimbra (sending Port 25 NO auth)!!! My guest in the hotel cannot send their mails to their own isp´s mailservers directly because they are NATed and do have our external ip and so they are rejected by their mta!
Right now i use an old sendmailserver and some firewall rules to fetch outgoing mails on port 25and check these internal mails (spam and virus) but this machine has to retire....
just need a short howto setup relaying from internal throu zimbra´s postfix-amavis-spamassisn to my external smtp-relay of my provider....
Thanks...
René
My setup OpenSuSE 10.0 Zimbra 3.1
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Set up a internal open relay 
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