I’m not sure what to tell you other than i followed all the guidelines directly out of the mailcow documentation. these are the instructions I used for disabling ipv6
otherwise this is a standard vanilla install that i haven’t player around with at all. I need to know specifically if you want to see certain logs or settings, because i have no idea where to look for anything that might resemble a smoking gun. after 6 months of this server and playing with it every few days, the only thing I have found is that the /var/spool/postfix/etc/resolve.conf does not exist.