On 2009-09-15 Paul Beard wrote:
> 554 5.1.0 <xx...@example.org>: Sender address rejected: User unknown
> in virtual alias table
[...]
> virtual_alias_domains = example.org
> virtual_alias_maps = hash:/usr/local/etc/postfix/example.cf

If mail sent to xx...@example.org should be delivered to local mailbox
YYYYY, you need a line like this in example.cf:

----8<----
xx...@example.org YYYYY
---->8----

Is that line present in /usr/local/etc/postfix/example.cf, and did you
run "postmap /usr/local/etc/postfix/example.cf"?

Regards
Ansgar Wiechers
-- 
"All vulnerabilities deserve a public fear period prior to patches
becoming available."
--Jason Coombs on Bugtraq

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