On Wed, Apr 18, 2018 at 04:15:19PM +0200, Alfredo De Luca wrote:
> We have 2 domain managed by postfix.
> 
> When I send an email to an not existing user in the first donain I
> got back an email user unknown...

"User unknown in virtual mailbox table" means the domain was found in 
virtual_mailbox_domains, but the user@domain was NOT found in
virtual_mailbox_maps.

> ..while if I send it to the second domain I don't
> receive anything.
> 
> Any issue/clue on this?

See your logs, and see Angelo's post if you need help with it.
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