Создаем коннектор отправки

<code ini>
su - zimbra

/opt/zimbra/bin/zmprov gacf | grep zimbraMtaTransportMaps

cat >> /opt/zimbra/mytransport << "EOF"
site.com smtp:[192.168.3.23]
EOF

chmod g+w /opt/zimbra/mytransport; chgrp zimbra /opt/zimbra/mytransport
/opt/zimbra/bin/zmprov mcf zimbraMtaTransportMaps "proxy:ldap:/opt/zimbra/conf/ldap-transport.cf, lmdb:/opt/zimbra/mytransport"
postmap lmdb:/opt/zimbra/mytransport
su - zimbra -c "/opt/zimbra/bin/zmmtactl reload"
</code>

Лечим web 500  после обновления на 8....

<code ini>
mailboxd_java_options = -server -Dhttps.protocols=TLSv1,TLSv1.1,TLSv1.2 -Djdk.tls.client.protocols=TLSv1,TLSv1.1,TLSv1.2 -Djava.awt.headless=true -Dsun.net.inetaddr.ttl= -Dorg.apache.jasper.compiler.disablejsr199=true -XX:+UseG1GC -XX:SoftRefLRUPolicyMSPerMB=1 -XX:-OmitStackTraceInFastThrow -verbose:gc -Xlog:gc*=debug,safepoint=info:file=/opt/zimbra/log/gc.log:time:filecount=20,filesize=10m -Djava.security.egd=file:/dev/./urandom --add-opens java.base/java.lang=ALL-UNNAMED -Djava.net.preferIPv4Stack=true
</code>