> > > Apr 4 09:12:41 grisu postfix/smtp[24340]: 6A8A17735:
> > to=<usernbg.sbs.de>, relay=gecko.sbs.de[194.138.37.40],
> > delay=5004, status=deferred (host gecko.sbs.de[194.138.37.40] said:
> > 451 4.1.8 <user1soft-gate.de>... Domain of sender address
> > user1soft-gate.de does not resolve)
>
> 451 indicates a soft error on their side. Maybe their DNS is hosed?
> I can get an MX record for soft-gate.de:
>
> ;; ANSWER SECTION:
> soft-gate.de. 1D IN MX 2 grisu-gw.soft-gate.de.
> soft-gate.de. 1D IN MX 4 www.soft-gate.de.

Is it possible that a not working reverse-lookup causes this problem.
I've checked the reverse-lookup at our ISP's secondary NS (pns.dtag.de)
and it couldn't resolve.
 
> > 2nd) connect to transport ...: connection refused
> > On fw2 /var/log/mail shows the following, where host.soft-gate.de is
> > the host (w2k-server) specified in transport for domains soft-gate.de and
> > .soft-gate.de.
> >
> > > Apr 4 09:09:36 fw2 postfix/pickup[10336]: A572864C7: uid=0 from=<root>
> > > Apr 4 09:09:36 fw2 postfix/cleanup[10365]: A572864C7:
> > message-id=<20010404070936.A572864C7fw2.soft-gate.de>
> > > Apr 4 09:09:36 fw2 postfix/qmgr[10337]: A572864C7:
> > from=<rootsoft-gate.de>, size=332 (queue active)
> > > Apr 4 09:09:36 fw2 postfix/qmgr[10337]: warning: connect to
> > transport host.soft-gate.de: Connection refused
> > > Apr 4 09:10:36 fw2 postfix/qmgr[10337]: warning: connect to
> > transport host.soft-gate.de: Connection refused
>
> You have a transport called "host.soft-gate.de" ?? That's most probably
> not correct.

Ok. It's called berlin.soft-gate.de not host.soft-gate.de.

> Show "postconf -n" and master.cf and the contents of your transport
> file!

transport:
 soft-gate.de berlin.soft-gate.de
 .soft-gate.de berlin.soft-gate.de
 # localhost.soft-gate.de local:
 # fw2.soft-gate.de local:
 test.company.de smtp:fw1
 .company.de smtp:mail.company.de

postconf -n
 alias_database = hash:/etc/postfix/aliases
 alias_maps = hash:/etc/postfix/aliases
 allow_percent_hack = no
 allow_untrusted_routing = no
 command_directory = /usr/sbin
 daemon_directory = /usr/lib/postfix
 default_destination_concurrency_limit = 10
 default_privs = nobody
 header_checks = regexp:/etc/postfix/header_checks.regexp
 inet_interfaces = all
 local_destination_concurrency_limit = 2
 luser_relay =
 mail_owner = postfix
 message_size_limit = 20480000
 mydestination = $myhostname, localhost.$mydomain, $mydomain
 mydomain = soft-gate.de
 myhostname = fw2.soft-gate.de
 mynetworks = aaa.bbb.ccc.0/24, 127.0.0.0/8
 myorigin = soft-gate.de
 notify_classes = resource, software, bounce, delay, policy, protocol
 program_directory = /usr/lib/postfix
 queue_directory = /var/spool/postfix
 relay_domains =
 relocated_maps = hash:/etc/postfix/relocated
 smtpd_recipient_restrictions =
     reject_non_fqdn_sender,
     check_sender_access hash:/etc/postfix/sender_blacklist,
     check_recipient_access regexp:/etc/postfix/recipient_checks.regexp,
     check_recipient_access hash:/etc/postfix/recipient_checks,
     check_sender_access regexp:/etc/postfix/sender_checks.regexp,
     check_sender_access hash:/etc/postfix/sender_checks,
     reject
 swap_bangpath = no
 transport_maps = hash:/etc/postfix/transport

master.cf
 smtp inet n - y - - smtpd
 pickup fifo n n n 60 1 pickup
 cleanup unix - - n - 0 cleanup
 qmgr fifo n - n 5 1 qmgr
 rewrite unix - - y - - trivial-rewrite
 bounce unix - - y - 0 bounce
 defer unix - - y - 0 bounce
 smtp unix - - y - - smtp
 showq unix n - n - - showq
 error unix - - n - - error
 # local unix - n n - - local
 cyrus unix - n n - - pipe
     flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
 uucp unix - n n - - pipe
     flags=F user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
 ifmail unix - n n - - pipe
     flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
 bsmtp unix - n n - - pipe
     flags=F. user=foo argv=/usr/local/sbin/bsmtp -f $sender $nexthop $recipient

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