I'm using Zimbra in my company but the system receive very high level of spam backscatterer.
Actually, this is the Antispam configuration in admin panel of Zimbra : 20% tags SPAM and 90% delete SPAM.
And, this is the restriction enabled on the MTA :
zimbra@mail01:/root$ zmprov gacf | grep zimbraMtaRestriction
zimbraMtaRestriction: check_policy_service unixrivate/policy
zimbraMtaRestriction: reject_rbl_client bl.spamcop.net
zimbraMtaRestriction: reject_rbl_client dnsbl.sorbs.net
zimbraMtaRestriction: reject_rbl_client sbl.spamhaus.org
But I've a question, what is the perfect solution to delete this backscatterer spam in Zimbra 8 ? If anyone have an howto for Zimbra v8, please ?
Why Zimbra doesn't made default configuration to delete this spam ?
Thank you in advance for your help.