Not much new to report, except that this time I also had to restore my custom setting for delayed mail warning:
Somehow I think this was preserved in earlier upgrades, but it looks like it was lost in this one.
[zimbra@zimbra conf]$ postconf -e delay_warning_time=2h
[zimbra@zimbra conf]$ zmlocalconfig -e postfix_delay_warning_time=2h
[zimbra@zimbra conf]$ grep -i warn /opt/zimbra/postfix/conf/main.cf
delay_warning_time = 2h
[zimbra@zimbra conf]$ postfix stop; postfix start
Also patched per http://www.zimbra.com/forums/announc...6-0-12-p1.html, took no time at all.