Full logs of sending an emails:
Oct 16 21:09:00 ns341442 postfix/smtpd[15105]: connect from localhost[::1]
Oct 16 21:09:00 ns341442 postfix/smtpd[15105]: 903B61AA0954: client=localhost[::1], sasl_method=PLAIN, sasl_username=kontakt@example.pl
Oct 16 21:09:00 ns341442 postfix/cleanup[15112]: 903B61AA0954: message-id=<20201016190900.903B61AA0954@ns341442>
Oct 16 21:09:00 ns341442 opendkim[13702]: 903B61AA0954: DKIM-Signature field added (s=default, d=example.pl)
Oct 16 21:09:00 ns341442 postfix/qmgr[14745]: 903B61AA0954: from=<kontakt@example.pl>, size=760, nrcpt=1 (queue active)
Oct 16 21:09:00 ns341442 postfix/smtp[14746]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Oct 16 21:09:00 ns341442 postfix/smtp[14746]: 903B61AA0954: to=<test@example.com>, relay=none, delay=0.12, delays=0.12/0/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Oct 16 21:09:00 ns341442 postfix/smtpd[15105]: disconnect from localhost[::1] ehlo=1 auth=1 mail=1 rcpt=1 data=1 commands=5
