Feb 1 08:51:20 f64ab73cad98 postfix/master[394]: daemon started -- version 3.5.23, configuration /opt/postfix/conf
postfix-mailcow-1 | Feb 1 08:51:37 f64ab73cad98 postfix/master[394]: warning: process /usr/lib/postfix/sbin/smtpd pid 402 exit status 1
postfix-mailcow-1 | Feb 1 08:51:37 f64ab73cad98 postfix/master[394]: warning: /usr/lib/postfix/sbin/smtpd: bad command startup -- throttling
postfix-mailcow-1 | Feb 1 08:51:40 f64ab73cad98 postfix/master[394]: warning: process /usr/lib/postfix/sbin/smtpd pid 400 exit status 1
The server seems to running fine.