dear fbartels,
thanks for ur help.
Here it will come some more logs:
Test from Thunderbird:
Jun 26 08:20:21 ucs postfix/smtpd[93269]: connect from unknown[192.168.178.29]
Jun 26 08:20:21 ucs postfix/smtpd[93269]: 76BD9187E09: client=unknown[192.168.178.29], sasl_method=PLAIN, sasl_username=timo@xxx.de
Jun 26 08:20:21 ucs postfix/cleanup[93272]: 76BD9187E09: message-id=<739606d0-1b0c-dd8c-7c2a-64882ffabe9e@xxx.de>
Jun 26 08:20:21 ucs postfix/qmgr[82652]: 76BD9187E09: from=<timo@xxx.de>, size=37769, nrcpt=1 (queue active)
Jun 26 08:20:21 ucs postfix/smtp[93273]: warning: database /etc/postfix/tls_policy.db is older than source file /etc/postfix/tls_policy
Jun 26 08:20:21 ucs postfix/smtpd[93276]: connect from localhost[127.0.0.1]
Jun 26 08:20:21 ucs postfix/smtpd[93276]: D4022187E11: client=localhost[127.0.0.1], orig_queue_id=76BD9187E09, orig_client=unknown[192.168.178.29]
Jun 26 08:20:21 ucs postfix/cleanup[93272]: D4022187E11: message-id=<739606d0-1b0c-dd8c-7c2a-64882ffabe9e@xxx.de>
Jun 26 08:20:21 ucs postfix/smtpd[93276]: disconnect from localhost[127.0.0.1] ehlo=1 xforward=1 mail=1 rcpt=1 data=1 quit=1 commands=6
Jun 26 08:20:21 ucs postfix/qmgr[82652]: D4022187E11: from=<timo@xxx.de>, size=38233, nrcpt=1 (queue active)
Jun 26 08:20:21 ucs amavis[84103]: (84103-06) Passed CLEAN {RelayedOutbound}, LOCAL [192.168.178.29]:58634 <timo@xxx.de> -> <irgendwas@test.de>, Queue-ID: 76BD9187E09, Message-ID: <739606d0-1b0c-dd8c-7c2a-64882ffabe9e@xxx.de>, mail_id: 19mxOlFHjf7b, Hits: -0.988, size: 37768, queued_as: D4022187E11, 230 ms
Jun 26 08:20:21 ucs postfix/smtp[93273]: 76BD9187E09: to=<irgendwas@test.de>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.43, delays=0.18/0.01/0/0.23, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as D4022187E11)
Jun 26 08:20:21 ucs postfix/qmgr[82652]: 76BD9187E09: removed
Jun 26 08:20:21 ucs postfix/smtp[93277]: warning: database /etc/postfix/tls_policy.db is older than source file /etc/postfix/tls_policy
Jun 26 08:20:21 ucs postfix/smtpd[93269]: disconnect from unknown[192.168.178.29] ehlo=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=6
Jun 26 08:20:22 ucs postfix/smtp[93277]: D4022187E11: to=<irgendwas@test.de>, relay=smtprelaypool.ispgateway.de[80.67.29.4]:587, delay=0.39, delays=0.02/0.01/0.27/0.09, dsn=2.0.0, status=sent (250 OK id=1hg1I6-0006UZ-5k)
Jun 26 08:20:22 ucs postfix/qmgr[82652]: D4022187E11: removed
Jun 26 08:20:22 ucs kopano-gateway[584]: Client disconnected
TEST FROM WebAPP
Jun 26 08:21:22 ucs kopano-spooler[93393]: Starting kopano-spooler version 8.7.1 (pid 93393 uid 998)
Jun 26 08:21:22 ucs kopano-spooler[93393]: RCPT line gave SMTP error 550 relay not permitted. (no retry)
Jun 26 08:21:22 ucs kopano-spooler[93393]: SMTP: Error while executing command 'DATA'. Response: 503 All RCPT commands were rejected with this error:#012relay not permitted#012Valid RCPT command must precede DATA
Jun 26 08:21:22 ucs kopano-spooler[93393]: E-mail for user timo could not be sent, notifying user: cancel message (40580)