Wietse Venema wrote:
Richard Wolterink:
Aug 5 18:37:36 vps683 postfix/bounce[15429]: warning: unexpected attribute W from bounce socket (expecting: nrequest)
Aug  5 18:37:36 vps683 postfix/bounce[15429]: warning: malformed request

In master.cf you have turned on the wakeup timer for the bounce service.

See: man 5 master.

Only these entries have a wakeup timer by default:
pickup    fifo  n       -       n       60      1       pickup
qmgr      fifo  n       -       n       300     1       qmgr
#qmgr     fifo  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       n       1000?   1       tlsmgr
flush     unix  n       -       n       1000?   0       flush

        Wietse

It looks something goes wrong with bounces wich are generated for mails send to 
users which do not exist on the server. But what do these entries exactly mean 
and what can I do to correct them?

You should configure your system so it doesn't accept then bounce unknown recipients; they should be rejected during SMTP and not generate a bounce. Accepting and bouncing adds extra load to your server, clogs your queue with undeliverable bounces, and annoys innocent forged senders with your backscatter. Here's a place to start with fixing the problem:
http://www.postfix.org/LOCAL_RECIPIENT_README.html

--
Noel Jones

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