It worked.I configured PMG to add the X-PMG-Flag header: YESI created a file /opt/zextras/data/spamassassin/localrules/zzsauser.cfheader PMG_SPAM X-PM...

I will configure PMG to send a custom header to carbonio and test.Thanks.

Thank you. I just installed a carbonio and was going to test Zimbra tools like zmbkpose.