V?clav Pernica:
> The idea is redirect the inbound mail into scrip which check if
> user exists in oracle, then determine the path from user ID and
> export it eg. like environmental variable. Such message could be

Specify:

/etc/postfix/main.cf:
    virtual_mailbox_maps = tcp:host:port

where you provide a TCP server that answers queries with a pathname
or with notfound.

References:
http://www.postfix.org/tcp_table.5.html
http://www.postfix.org/postconf.5.html#virtual_mailbox_maps

        Wietse

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