Am 19.07.2020 um 21:44 schrieb Nils:
Postconf: https://pastebin.com/vTVn2UMr Doveconf: https://pastebin.com/nEpZrpzB
Oh no, please
postconf -n postconf -Mf doveconf -n
all my logs from mail.(warn,err,info,log): https://pastebin.com/ccEVUqyd
Make sure your MUA is setup to make a STARTTLS connection to Postfix's submission port. I don't see that in your logs.
my messges log: https://pastebin.com/cXaEBmcH
See https://doc.dovecot.org/admin_manual/logging/ for debugging your connections to dovecot.
I'm not sure if you meant this about dict_nis_init but I've done what's explained here: https://unix.stackexchange.com/questions/244199/postfix-mail-logs-keep-showi...
I still see "warning: dict_nis_init: NIS domain name not set - NIS lookups disabled" in your pasted logs.
Alexander