We got it. Our mailserver didn't work with "sendmail" - SMTP works.
-- Open Source as Download https://zammad.org || Easy to use as SaaS https://zammad.com --- You received this message because you are subscribed to the Google Groups "zammad-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to zammad-users+unsubscr...@googlegroups.com. To post to this group, send email to email@example.com. To view this discussion on the web visit https://groups.google.com/d/msgid/zammad-users/7590d49f-897f-4868-b733-2b71ed7184dc%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.