I need some help with my Dovecot and Postfix configs - I'm unable to log in on my mail server

[Nils]

 > Oh no, please
I'm sorry, here:
postconf -n https://pastebin.com/UQQhieMy
postconf -Mf https://pastebin.com/AHEUSkfQ
doveconf -n https://pastebin.com/s7DVY9XW

 > Make sure your MUA is setup to make a STARTTLS connection to 
Postfix's submission port. I don't see that in your logs.
https://imgur.com/a/3MJXRUh
This is the configuration. Afaik thats also the correct port for SMTP.
I've also checked that all the ports are open on the server (via 
netstat): https://pastebin.com/tY6rSi8y
I have (currently) no firewall installed so there aren't any ports 
blocked either.
Since it's in an internal network there is also no ISP which can block 
any ports (and I've also already added a few mailboxes from other 
sources without any problems).

 > I still see "warning: dict_nis_init: NIS domain name not set - NIS 
lookups disabled" in your pasted logs.
It's only there bc this logs are made before I made the change in config 
regarding this.
Can't find it in any newer entries after restarting postfix.

On 19/07/2020 21:53, Alexander Dalloz wrote:
> 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-showing-nis-domain-not-set
>
> I still see "warning: dict_nis_init: NIS domain name not set - NIS 
> lookups disabled" in your pasted logs.
>
> Alexander