Hiện tại bên cty mình chạy mail server zimbra, vì môt số email public ra ngoài nhiều quá nên nhận mail spam linh tinh. Mình xin hỏi giải pháp chống spam cho zimbra đươc thực hiện như thế nào? mình chưa có kinh nghiệm về vụ này. Mong mọi người chia sẽ,thân. 

smtpd_recipient_restrictions = check_client_access hash:/etc/mail/acl/list.txt, check_policy_service inet:127.0.0.1:10001, permit_mynetworks, reject_invalid_helo_hostname, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_unauth_destination, permit_sasl_authenticated, reject_rbl_client bl.spamcop.net, reject_rbl_client relays.mail-abuse.org, reject_rbl_client combined.njabl.org

acl restrict_spf spf softfail=reject,neutral=reject
action reject_bad_spf REJECT [SPF:fail] Sender spoofing detected
access restrict_spf reject_bad_spf

Apr 24 05:53:44 mailserver postfix/smtpd[6214]: 8C58658A93B: client=unknown[217.149.28.10]
Apr 24 05:53:45 mailserver postfix/cleanup[23718]: 8C58658A93B: message-id=<7910247037.T6LUS6L8647909@lofwlwac.rgydmseua.biz>
Apr 24 05:53:45 mailserver dkim-filter[4584]: 8C58658A93B: can't parse From: header value `'
Apr 24 05:53:45 mailserver dk-filter[4577]: 8C58658A93B: can't parse From: header
Apr 24 05:53:45 mailserver postfix/qmgr[25300]: 8C58658A93B: from=<aaaaa@public.qd.sd.cn>, size=1945, nrcpt=1 (queue active)
Apr 24 05:53:45 mailserver amavis[11601]: (11601-10) ESMTP::10024 /opt/zimbra/data/amavisd/tmp/amavis-20110424T034742-11601: <aaaaa@public.qd.sd.cn> -> <myuser@mydomain> SIZE=1945 BODY=7BIT Received: from mymailserver ([127.0.0.1]) by localhost (mymailserver [127.0.0.1]) (amavisd-new, port 10024) with ESMTP for <myuser@mydomain>; Sun, 24 Apr 2011 05:53:45 +0700 (ICT)
Apr 24 05:53:45 mailserver amavis[11601]: (11601-10) Checking: uOP61O9BKWy4 [217.149.28.10] <aaaaa@public.qd.sd.cn> -> <myuser@mydomain>
8C58658A93B: to=<myuser@mydomain>, orig_to=<myuser@mydomain>, relay=127.0.0.1[127.0.0.1]:10024, delay=3.2, delays=2.4/0/0/0.79, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=11601-10, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 27AA758A97C)
Apr 24 05:53:46 mailserver postfix/qmgr[25300]: 8C58658A93B: removed
 

Return-Path: aaaaa@public.qd.sd.cn
Received: from mymailserver (LHLO
mymailserver) (x.x.x.x) by mymailserver with
LMTP; Sun, 24 Apr 2011 05:54:59 +0700 (ICT)
Received: from localhost (localhost.localdomain [127.0.0.1])
by mymailserver (Postfix) with ESMTP id 27AA758A97C
for <myuser@mydomain>; Sun, 24 Apr 2011 05:53:46 +0700 (ICT)
X-Virus-Scanned: amavisd-new at mydomain
X-Spam-Flag: NO
X-Spam-Score: 1.885
X-Spam-Level: *
X-Spam-Status: No, score=1.885 tagged_above=-10 required=6.6
tests=[BAYES_50=0.8, DNS_FROM_RFC_DSN=0.001, FH_FROMEML_NOTLD=1.082,
HK_RANDOM_ENVFROM=0.001, UNPARSEABLE_RELAY=0.001] autolearn=no
Received: from mymailserver ([127.0.0.1])
by localhost (mymailserver [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id uOP61O9BKWy4 for <myuser@mydomain>;
Sun, 24 Apr 2011 05:53:45 +0700 (ICT)
Received: from [217.149.28.10] (unknown [217.149.28.10])
by mymailserver (Postfix) with ESMTP id 8C58658A93B
for <myuser@mydomain>; Sun, 24 Apr 2011 05:53:43 +0700 (ICT)
Authentication-Results: mymailserver; domainkeys=permerror (bad format)
Received: from 217.149.28.10 (account HELO mydomain)
by mydomain (CommuniGate Pro SMTP 5.2.3)
with ESMTPA id 237613918 for <myuser@mydomain>; Sun, 24 Apr 2011 01:54:55 +0300
From:
To:
Subject: Newsletter Sun, 24 Apr 2011 01:54:55 +0300
Date: Sun, 24 Apr 2011 01:54:55 +0300
MIME-Version: 1.0
Content-Type: text/plain;
charset="windows-1250"
Content-Transfer-Encoding: 7bit
X-Mailer: smjlo 13
Message-ID: <7910247037.T6LUS6L8647909@lofwlwac.rgydmseua.biz>

spam content