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1.postfix搭建根据这个地址自己安装。
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2.yum安装，此安装包可以通过RPMForge软件仓库安装。
# yum install -y amavisd-new clamav clamav-devel clamd spamassassin
3.查看服务的开机自动启动状态
# chkconfig --list | grep "amavisd\|clamd\|spamassassin" amavisd 0:off 1:off 2:on 3:on 4:on 5:on 6:off clamd 0:off 1:off 2:on 3:on 4:on 5:on 6:off spamassassin 0:off 1:off 2:off 3:off 4:off 5:off 6:off
spamassassin这个服务没有启动，因为awavis-new直接将spamassassin作为一个模块使用。
4.修改spamassassin配置
# vi /etc/mail/spamassassin/local.cf required_hits 5 report_safe 0 rewrite_header Subject [SPAM] use_bayes 1 bayes_auto_learn 1 skip_rbl_checks 0 use_razor2 1 use_pyzor 0
5.修改clamav配置
# vim /etc/clamd.conf #利用本地通信 LocalSocket /var/run/clamav/clamd.sock #注释掉TCP通信端口 #TCPSocket 3310
6.修改amavis配置
# vim /etc/amavisd.conf
(1).通过去除以下数行的注释来停止检查病毒域垃圾邮件（由于下面数行默认是被注释掉的，因此病毒及垃圾邮件在预设中默认是被启动的）
@bypass_virus_checks_maps = (1); # controls running of anti-virus code
@bypass_spam_checks_maps = (1); # controls running of anti-spam code
$bypass_decode_parts = 1; # controls running of decoders&dearchivers
(2).接着可以看到下面几行
$max_servers = 2; # num of pre-forked children (2..30 is common), -m
$daemon_user = "amavis"; # (no default; customary: vscan or amavis), -u
$daemon_group = "amavis"; # (no default; customary: vscan or amavis), -g
$inet_socket_port = 10024; # listen on this local TCP port(s)
# $notify_method = 'smtp:[127.0.0.1]:10025';
# $forward_method = 'smtp:[127.0.0.1]:10025'; # set to undef with milter!
$max_servers 设定同步执行的Amavisd-new进程数量，而且必须与/etc/postfix/master.cf内的amavisfeed服务的maxproc中相符合
$daemon_user及$daemon_group应该用来匹配Amavisd-new的用户及群组
$inet_socket_port 定义Amavisd-new将会在哪一个tcp端口接纳来自Postfix的连接
$notify_method及$forward_method定义Amavisd-new把邮件重新注入Postfix的途径
(3).以下是必须修改项
$mydomain = 'meihua.info'; #我这里是free.com域
$MYHOME = '/var/amavis';
$helpers_home = "$MYHOME/var";
$lock_file = "$MYHOME/var/amavisd.lock";
$pid_file = "$MYHOME/var/amavisd.pid";
$myhostname = 'mail.meihua.info'; #我这里是mail.meihua.info主机
(4).下面是SpamAssassin设定来替换预设的SpamAssassin设置
$sa_tag_level_deflt = 2.0; # add spam info headers if at, or above that level
$sa_tag2_level_deflt = 6.2; # add 'spam detected' headers at that level
$sa_kill_level_deflt = 6.9; # triggers spam evasive actions (e.g. blocks mail)
$sa_dsn_cutoff_level = 10; # spam level beyond which a DSN is not sent
$sa_crediblefrom_dsn_cutoff_level = 18; # likewise, but for a likely valid From
# $sa_quarantine_cutoff_level = 25; # spam level beyond which quarantine is off
$penpals_bonus_score = 8; # (no effect without a @storage_sql_dsn database)
$penpals_threshold_high = $sa_kill_level_deflt; # don't waste time on hi spam
$bounce_killer_score = 100; # spam score points to add for joe-jobbed bounces
$sa_mail_body_size_limit = 400*1024; # don't waste time on SA if mail is larger
$sa_local_tests_only = 0; # only tests which do not require internet access?
说明，默认不需要修改但你得知道它们和意义，可以方便的帮助我们设置垃圾邮件‘
$sa_tag_level_deflt 指定Amavisd-new由哪一个级别开始写入X-Spam-Flag、X-Spam-Score、X-Spam-Status等垃圾邮件资讯标头，假如你想为所有邮件加入资讯标头，请把此值设为 -999
$sa_tag2_level_deflt 指定由哪一个级别开始在垃圾邮件的标头上标签它们
$sa_kill_level_deflt 指定Amavisd-new由哪一个级别开始拦截和扣留邮件。这个用途很大，因为SpamAssassin在预设情况下不会这样做
$sa_dsn_cutoff_level 指定由哪一个级别开始寄件失败通告不会被发送给寄件人。由于多数垃圾邮件寄件者的地址都是伪造的，不为明显的垃圾邮件发送寄件失败通告是最合理的，要不然你只会加剧反向散寄的问题
$sa_quarantine_cutoff_level 指定哪一个级别开始不必扣留垃圾邮件。这个选项预设是被注释掉的，意思是所有邮件都会被扣留
(5).下面是发送通告的邮件地址（默认是管理员邮箱，接收垃圾邮件通告的邮箱）
$virus_admin = "postmaster\@$mydomain"; # notifications recip.
$mailfrom_notify_admin = "postmaster\@$mydomain"; # notifications sender
$mailfrom_notify_recip = "postmaster\@$mydomain"; # notifications sender
$mailfrom_notify_spamadmin = "postmaster\@$mydomain"; # notifications sender
(6).设置ClamAV的部分
# ### http://www.clamav.net/
['ClamAV-clamd',
\&ask_daemon, ["CONTSCAN {}\n", "/var/run/clamav/clamd.sock"],
qr/\bOK$/m, qr/\bFOUND$/m,
qr/^.*?: (?!Infected Archive)(.*) FOUND$/m ],
说明，/var/run/clamav/clamd.sock这个设定必须与我们先前在/etc/clamd.conf内输入的LocalSocket /var/run/clamav/clamd.sock设定相一致。7.修改postfix master.cf配置
# vim /etc/postfix/master.cf # ========================================================================== # # service type private unpriv chroot wakeup maxproc command + args # # (yes) (yes) (yes) (never) (100) # # ========================================================================== # # amavisfeed unix - - n - 2 smtp -o smtp_data_done_timeout=1200 -o smtp_send_xforward_command=yes -o smtp_tls_note_starttls_offer=no -o disable_DNS_lookups=yes -o max_use=20 说明，请注意在maxproc栏内的数值 2 必须要与/etc/amavisd.conf内的$max_servers设定一致。有关各选项的详细解释请参阅Amavisd-new的文档（vim /usr/share/doc/amavisd-new-2.8.0/README.postfix）。然后我们定义一个专用的服务把邮件重新注入Postfix。我们为此在/etc/postfix/master.cf内加入一个在localhost(127.0.0.1)的tcp 10025端口（/etc/amavisd.conf的预设值）上监听的smtp服务： # ========================================================================== # # service type private unpriv chroot wakeup maxproc command + args # # (yes) (yes) (yes) (never) (100) # # ========================================================================== 127.0.0.1:10025 inet n - n - - smtpd -o content_filter= -o smtpd_delay_reject=no -o smtpd_client_restrictions=permit_mynetworks,reject -o smtpd_helo_restrictions= -o smtpd_sender_restrictions= -o smtpd_recipient_restrictions=permit_mynetworks,reject -o smtpd_data_restrictions=reject_unauth_pipelining -o smtpd_end_of_data_restrictions= -o smtpd_restriction_classes= -o mynetworks=127.0.0.0/8 -o smtpd_error_sleep_time=0 -o smtpd_soft_error_limit=1001 -o smtpd_hard_error_limit=1000 -o smtpd_client_connection_count_limit=0 -o smtpd_client_connection_rate_limit=0 -o receive_override_options=no_header_body_checks,no_unknown_recipient_checks,no_milters,no_address_mappings -o local_header_rewrite_clients= -o smtpd_milters= -o local_recipient_maps=
8.修改postfix main.cf配置
# vim /etc/postfix/main.cf #filter mail content_filter = amavisfeed:[127.0.0.1]:10024
9.重启postfix，clamd，amavis服务
# service postfix restart Shutting down postfix: [ OK ] Starting postfix: [ OK ] # service clamd start Starting Clam AntiVirus Daemon: LibClamAV Warning: ************************************************** LibClamAV Warning: *** The virus database is older than 7 days! *** LibClamAV Warning: *** Please update it as soon as possible. *** LibClamAV Warning: ************************************************** [ OK ] # service amavisd start Starting Mail Virus Scanner (amavisd): [ OK ]