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

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