On Mon, Mar 29, 2021 at 08:23:40AM +0200, DEPRÉ Gaëtan - NGServers.com wrote:

> I modified the files master.cf & main.cf as you adviced. 
> 
> The command postmap -q y...@mydomain.dom "$(postconf -Phx 
> smtps/inet/smtpd_sender_login_maps)"
> returns me the two users that are able to send email from.
> 
> Everything, is working, the problem was the invert with 'owned' & 'owner'.

Congrats.  I should perhaps note that with SQL you hardly need a
unionmap:

    query = SELECT email as user FROM virtual_users WHERE email='%s' UNION
            SELECT owned as user FROM virtual_delegation WHERE owner='%s'

-- 
    Viktor.

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