Am having zero success using the smtpd_sasl_authenticated_header postfix setting on 5.0.15. Added:
POSTCONF smtpd_sasl_authenticated_header yes
SECTION mta DEPENDS amavis
in /opt/zimbra/conf/zmmta.cf and restarted the mta. Looks like all the right things are happening with the config files, but no "authenticated sender" headers appear on messages sent from non-zimbra clients (like tbird, evolution, etc.)
Checked /opt/zimbra/postfix/conf/main.cf and see that the setting is taking, so I am at a complete loss. Any help would be greatly appreciated.