On Fri, May 30, 2025 at 02:31:59PM +0200, Christian H. Kuhn via Postfix-users 
wrote:

> reject: RCPT from list.sys4.de[45.90.5.195]: 450 4.1.1 <qno-post...@qno.de>:
> Recipient address rejected: unverified address: User unknown in virtual
> alias table; from=<postfix-users-boun...@postfix.org>
> to=<qno-post...@qno.de> proto=ESMTP helo=<list.sys4.de>

Address verification via "reject_unverified_recipient" applies to 
the ultimate recipient, after any, possibly recursive, address
rewriting.

> And still, i do not understand:
> recipient_delimiter = -
> virtual_alias_domains = $mydomain, sk-koenig-tegel.de

Are you sure you want "$mydomain" to be a virtual alias domain?  Are
there really no final recipients in that domain, just aliases into
*other* domains?

> and tables.d/virtual:
> 
> q...@qno.de qno

This rewrites to "qno@$myorigin", which is perhaps again "qno.de"
and if that's a virtual alias domain, the delivery fails!

> So in my limited understanding, qno-post...@qno.de should become q...@qno.de
> by recipient_delimiter, then system user qno

What is the address class of the "$myorigin" domain?  If "$myorigin"
is the same as "$mydomain", then it is a virtual alias domain, so the
address is not a "system user", but rather a virtual alias, which fails
to be rewritten out of the domain.

-- 
    Viktor.
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