Hello Noel Jones & Wietse Venema, thank you for your replies.
> Do you by any chance have more than one postfix instance running? No. See below for my master.cf and here are my running postfix process at the moment: anvil -l -t unix -u smtpd -n smtp -t inet -u -o stress= pickup -l -t fifo -u smtpd -n smtp -t inet -u -o stress= proxymap -t unix -u /usr/lib64/postfix/master qmgr -l -t fifo -u tlsmgr -l -t unix -u > - You have "-o mydestination=domain" in master.cf. No, thats not the case. See my master.cf below. > - You have more than one main.cf file. No, I have only one main.cf. Is there a possibility to debug this? Does trivial-rewrite support a "-v" like smtpd? Is it somehow possible to read out the actual used configuration from a running postfix instance? Here is my running master.cf: smtp inet n - n - - smtpd smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes pickup fifo n - n 60 1 pickup cleanup unix n - n - 0 cleanup qmgr fifo n - n 300 1 qmgr tlsmgr unix - - n 1000? 1 tlsmgr rewrite unix - - n - - trivial-rewrite bounce unix - - n - 0 bounce defer unix - - n - 0 bounce trace unix - - n - 0 bounce verify unix - - n - 1 verify flush unix n - n 1000? 0 flush proxymap unix - - n - - proxymap smtp unix - - n - - smtp error unix - - n - - error retry unix - - n - - error discard unix - - n - - discard anvil unix - - n - 1 anvil scache unix - - n - 1 scache dovecot unix - n n - - pipe user=mailbox:mailbox argv=/usr/libexec/dovecot/deliver -d ${recipient} mailman unix - n n - - pipe user=mailman:mailman argv=/usr/lib64/mailman/bin/postfix2mailman.rb ${user} Best regards. Bernd Lommerzheim