I tried the forwarder, sorry. With both fixes I'm able to create forwarder and account, but unfortunately the forwarder does not work ....
With only forwarder in place here is what I see in /var/log/mail.info
May 30 07:10:40 ladida postfix/smtpd[16189]: connect from mail-wm1-f48.google.com[xx.xx.xx.xx]
May 30 07:10:40 ladida Relay access denied/smtpd[16189]: NOQUEUE: reject: RCPT from mail-wm1-f48.google.com[xx.xx.xx.xx]: 554 5.7.1 <text@xn--umlautdmain-xfb.de>: Relay access denied; from=<xxxx@gmail.com> to=<text@xn--umlautdmain-xfb.de> proto=ESMTP helo=<mail-wm1-f48.google.com>
Adding "smtputf8_enable = no" Parameter in the main.cf makes the error-message disappear, but the E-Mails do not arrive at their destination
May 30 08:05:18 ladida postfix/pipe[18330]: 566641209FC: to=<text@xn--umlautdmain-xfb.de>, relay=dovecot, delay=0.31, delays=0.28/0.01/0/0.02, dsn=2.0.0, status=sent (delivered via dovecot service)
May 30 08:05:19 ladida postfix/smtp[18329]: 566641209FC: to=<xxxx@gmail.com>, orig_to=<text@xn--umlautdmain-xfb.de>, relay=gmail-smtp-in.l.google.com[xx.xx.xx.xx]:25, delay=0.91, delays=0.28/0.01/0.17/0.45, dsn=2.0.0, status=sent (250 2.0.0 OK 1685426718 o6-20020a5d58c6000000b0030aefaef7c3si885126wrf.337 - gsmtp)
Mails with Account only seem fine (send and receive ok), what is more important for me.
