postfix 2.7.1 private/smtp socket: malformed response

[neys <neys%neys.org@localhost>]

hi all,

I updated to postfix 2.7.1 from pkgsrc.current on three different 
servers (netbsd 5.0 amd64 and netbsd 4.0 i386). sending mail to local 
account does still work, but e.g. forwarting root mails to an external 
mail account via /etc/mail/aliases throws the following error in 
/var/log/maillog:

postfix/pickup[18928]: C5A75106E9F: uid=0 from=<root>
postfix/cleanup[29037]: C5A75106E9F: 
message-id=<20100721084751.C5A75106E9F%castor.example.org@localhost>
postfix/qmgr[21719]: C5A75106E9F: from=<root%hostname.example.org@localhost>, 
size=337, nrcpt=1 (queue active)
postfix/cleanup[29037]: CB11C106EA1: 
message-id=<20100721084751.C5A75106E9F%hostname.example.org@localhost>
postfix/local[15009]: C5A75106E9F: to=<root%hostname.example.org@localhost>, 
orig_to=<root>, relay=local, delay=0.04, delays=0.02/0.01/0/0, 
dsn=2.0.0, status=sent (forwarded as CB11C106EA1)
postfix/qmgr[21719]: CB11C106EA1: from=<root%hostname.example.org@localhost>, 
size=475, nrcpt=1 (queue active)
postfix/qmgr[21719]: C5A75106E9F: removed
postfix/qmgr[21719]: warning: private/smtp socket: malformed response
postfix/master[23335]: warning: process /usr/pkg/libexec/postfix/smtp 
pid 18013 killed by signal 6
postfix/master[23335]: warning: /usr/pkg/libexec/postfix/smtp: bad 
command startup -- throttling
castor postfix/qmgr[21719]: warning: transport smtp failure -- see a 
previous warning/fatal/panic logfile record for the problem description
postfix/error[22589]: CB11C106EA1: to=<root%example.org@localhost>, 
orig_to=<root>, relay=none, delay=0.03, delays=0/0.02/0/0.01, dsn=4.3.0, 
status=deferred (unknown mail transport error)

postfix 2.7.1 is compiled with default options as root. I also tried a 
new unmodified postfix configuration with only main.cf and master.cf in 
/usr/pkg/etc/postfix.

/etc/mailer.conf:
sendmail        /usr/pkg/sbin/sendmail
send-mail       /usr/pkg/sbin/sendmail
mailq           /usr/pkg/sbin/sendmail
newaliases      /usr/pkg/sbin/sendmail
hoststat        /usr/pkg/sbin/sendmail
purgestat       /usr/pkg/sbin/sendmail

/usr/pkg/sbin/postconf -n
command_directory = /usr/pkg/sbin
config_directory = /usr/pkg/etc/postfix
daemon_directory = /usr/pkg/libexec/postfix
data_directory = /var/db/postfix
debug_peer_level = 2
html_directory = no
mail_owner = postfix
mailq_path = /usr/pkg/bin/mailq
manpage_directory = /usr/pkg/man
newaliases_path = /usr/pkg/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/pkg/share/doc/postfix
sample_directory = /usr/pkg/share/examples/postfix
sendmail_path = /usr/pkg/sbin/sendmail
setgid_group = maildrop
unknown_local_recipient_reject_code = 550

do I need to change something in postfix/master.cf for external connections?


thanks in advance,

neys