User unknown in local recipient table

Hello all,
I try to inject messages into dbmail with postfix and
dbmail-smtp.
(dbmail 2.0.9)


dbmail    unix  -       n       n       -       -       pipe
            flags=  user=dbmail:dbmail
argv=/usr/local/sbin/dbmail-smtp -d $

I allready use dmbail for several years (5), now I want to
add a new
domain.
In postfix i've created in transport the new domain

/etc/postfix/transport
newdomain  dbmail:

Mail to a username of an already defined user(in unix) is
delivered into
dbmail as it should

but when i sent an email to an alias created with

dbmail-users -c Username -s pietnewdomain.com pietheinnewdomain
pznewdomain

or even

dbmail-users -c Username -s newdomain

I get the message:
<iemandnewdomain.com>: User unknown in local recipient
table)

What did i overlook???????

Thanks in advance......
Fons van der Beek

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