Hello, We are testing a new mail system and I want to duplicate mail flow to the new system at the same time allow flow to the exist system.
/ - CurrentMailhost.example.com (running Postfix) @example.com - \ - NewMailhost.example.com (running Postfix) In fact its deliver locally and relay. @example.com -- CurrentMailhost.example.com (running Postfix) \ - NewMailhost.example.com (running Postfix) Yes I want "duplicate" mail to flow to each system. I tried using the transport mapping for the domain, but it seems that duplicate entries are not allowed (though only a warning is logged) and only the first entry is used and mail will not be delivered to both. /etc/postfix/transport # delivery locally exmaple.com : # and forward a copy to a remove smtp gateway example.com smtp:newmailhost.example.com Does anyone have any other suggestions? Thanks Phil