> You might also reach out to the postfix mailing lists for help, as > you'll likely get better debugging tips for scenarios like this than > from a distribution-specific list. hi jeremy, thank you for your ideas, i took it to the postfix mailing lists now, but progress there is slow as well. the problem seem to hide very well. link to thread included for future reference [0]. have a nice christmas everyone georg [0] https://marc.info/?l=postfix-users&m=148248292712509&w=2