On Tue, Mar 27, 2012 at 10:21:14PM +0200, Sebastian Wiesinger wrote:
> I have a setup with handles a few virtual domains. For one domain 
> only I want mails not to be rejected with an 5xx error code but be 
> deferred with a 4xx error code. Is that possible?

main.cf :
smtpd_client_restrictions = check_recipient_access
    hash:/etc/postfix/deferred_recipient[, ... ]

deferred_recipient :

example.com             defer_if_reject
[ ... ]

http://www.postfix.org/SMTPD_ACCESS_README.html
http://www.postfix.org/postconf.5.html#check_recipient_access
http://www.postfix.org/postconf.5.html#defer_if_reject
http://www.postfix.org/access.5.html
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