Hi,
> >> smtpd_tls_session_cache_database
> >
> > This is defined to the default for all instances:
> > smtpd_tls_session_cache_database =
> > btree:/var/lib/postfix/smtpd_tls_session_cache
>
> That's wrong. The session cache needs to be:
>
> smtpd_tls_session_cache_database =
> ${data_directory}/smtpd_tls_session_cache
>
> with (enforced by postmulti) distict values of `data_directory`
> for each instance. Only the default instance gets to scribble
> in "/var/lib/postfix".
Ah yes, of course. Thank you.