On 25.07.19 00:24, Alex wrote:
Indeed, I don't know why

This is the pastebin of the files and the result of the commands :
https://pastebin.com/qjz30PY0

Thanks your for help!!

these are important parts:

AUTH LOGIN xxxxxxxx
334 UGFzc3dvcmQ6
xxxxxxxxxx
235 2.7.0 Authentication successful
mail from:cont...@euuuhh.tld
250 2.1.0 Ok
rcpt to:cont...@euuuhh.tld
451 4.3.5 <cont...@euuuhh.tld>: Sender address rejected: Server configuration 
error

Jul 23 09:44:54 ns1 postfix/smtpd[20799]: warning: SASL: Connect to 
private/auth failed: Connection refused
Jul 23 09:44:54 ns1 postfix/smtpd[20799]: warning: unknown[45.xx.xx.xx]: SASL 
LOGIN authentication failed:

Jul 23 14:46:23 ns1 dovecot: auth-worker(25874): 
sql(g...@euuuhhh.tld,45.xx.xx.xx): unknown user

it would be better if wou posted logs from the same time...

...have you followed SASL instructions in
/usr/share/doc/postfix/README.Debian.gz ?
(maybe dovecot has different postfix SASL integration manual)

btw seems your login/pasword appear in the de

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