How auto-use transport map?

[lipiqe]

Dear forum members!

I have a problem with my postfix.
I have a mail server (installed, configure based on this guide (

https://workaround.org/ispmail/wheezy).

I have 5 domains what I hosted on my server, but I need to use them just for sending.
For example I have example.com domain, I set DKIM, I set the spf records in the domain settings, but the users use the example.com via gmail.
When someone want to send email via my mail server for example to ted@example.com, then my server think he need to delier locally and drop, coz no mailbox.
I set transport map, but the problem the same. Then I created a mailbox for ted and works fine... The mail go out via the transport map settings.
So okay, cool. But I need to send this mails in this case when I dont create the box for user...
Any idea what I need to set? I readed many things, I tried many settings but I can't find the solution.

Thanks,
lipiqe