Confirmed by my own test - sorry for noise on this list:
Jul 8 10:23:14 mx3 postfix-cluster/smtpd[3564]: NOQUEUE: reject: RCPT from ipservice-047-071-140-188.pools.arcor-ip.net[47.71.140.188]: 554 5.7.1 <j...@ruv.de>: Relay access denied; from=<j...@ruv.de> to=<j...@ruv.de> proto=ESMTP helo=<ruv.de>
I have to admit that it's an old configuration (from a postfix 2.x setup). I think it's time to review it.
Case closed - thank you for postfix! Regards, jpk
