Hello,

currently I'm working on my first mailserver but I can't log in to the account I made. For now my client (Mozlla Thunderbird) detects the server config (STARTTLS, Port, ...) but it is "Unable to log in at server. Probbly wrong configuration, username or passsword".

I know that I added username and password correctly so there must something else be wrong.

I run Debian 10 x64 on a fresh installation.
Installed are: postfix, postfix-pcre, dovecot-core, dovecot-imapd and dovecot-pop3d.
Dovecot is version 2.3.4.1, Postfix is 3.4.10.

Here are my configurations:
Postfix main.cf: https://pastebin.com/S17jWDQd
Postfix master.cf: https://pastebin.com/W0nynZG6
dovecot.conf: https://pastebin.com/tMD90Znn

This is what my server logs (mail.info, mail.warn) tell me:
root@bgrsld-mail0:~# tail /var/log/mail.info
Jul 17 18:22:08 bgrsld-mail0 postfix/submission/smtpd[8472]: improper command pipelining after EHLO from unknown[192.168.2.110]: QUIT\r\n
Jul 17 18:22:08 bgrsld-mail0 postfix/submission/smtpd[8465]: disconnect from unknown[192.168.2.110] ehlo=1 quit=1 commands=2
Jul 17 18:22:08 bgrsld-mail0 postfix/submission/smtpd[8472]: disconnect from unknown[192.168.2.110] ehlo=1 quit=1 commands=2
Jul 17 18:24:59 bgrsld-mail0 postfix/submission/smtpd[8485]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Jul 17 18:24:59 bgrsld-mail0 postfix/submission/smtpd[8485]: connect from unknown[192.168.2.110]
Jul 17 18:24:59 bgrsld-mail0 postfix/submission/smtpd[8485]: improper command pipelining after EHLO from unknown[192.168.2.110]: QUIT\r\n
Jul 17 18:24:59 bgrsld-mail0 postfix/submission/smtpd[8485]: disconnect from unknown[192.168.2.110] ehlo=1 quit=1 commands=2
Jul 17 18:28:19 bgrsld-mail0 postfix/anvil[8473]: statistics: max connection rate 2/60s for (submission:192.168.2.110) at Jul 17 18:22:08
Jul 17 18:28:19 bgrsld-mail0 postfix/anvil[8473]: statistics: max connection count 2 for (submission:192.168.2.110) at Jul 17 18:22:08
Jul 17 18:28:19 bgrsld-mail0 postfix/anvil[8473]: statistics: max cache size 1 at Jul 17 18:22:08
root@bgrsld-mail0:~# tail /var/log/mail.warn
Jul 17 18:21:50 bgrsld-mail0 postfix/postfix-script[8290]: warning: symlink leaves directory: /etc/postfix/./makedefs.out
Jul 17 18:22:08 bgrsld-mail0 postfix/submission/smtpd[8465]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Jul 17 18:22:08 bgrsld-mail0 postfix/submission/smtpd[8472]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Jul 17 18:24:59 bgrsld-mail0 postfix/submission/smtpd[8485]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled

(I removed any information from older issues that are already solved, thats why mail.warn misses a few lines and there is no mail.err, mail.err hadn't any newer messages)

Here is my only line from dovecot's userpass file (/maildata/userpass):

nils@intern.xxx.xxx:{CRYPT}$2y$05$kkxElxFGsLSyTJwbEaPZzO/QA33vGY3oGyHcgEZa9rpklgBTKQw9O

My postfix vhosts file (/maildir/vhosts)

intern.xxx.xxx

My postfix vmaps file (/maildir/vmaps)

nils@intern.xxx.xxx intern.xxx.xxx/nils/

I've also created the hased database with 'postmap /maildata/vmaps'

This is the script I've used to create my user database: https://pastebin.com/9uViNqjB

I haven't worked with postfiy or dovecot yet so there are many things I don't know. Because of this a lot of my configurations is copied from an iRedMail installation. I know that taking these configs may cause some problems but I don't know where to change them or what else is wrong or missing.

Thank you for any help!