Linux服务器---邮件服务spam

安装spam

spam（SpamAssassin）利用perl来进行文字分析，他会检测邮件的标题、内容、送信人，这样就可以过滤出垃圾邮件

1、安装spam。由于spam的依赖太多，用户一定要使用yum源来安装，这样减少不必要的麻烦

[root@localhost ~]# rpm -qa | grep spamassassin

[root@localhost openwebmail]# yum install -y spamassassin

Complete!

2、配置postfix使用spam功能，修改配置文件“/etc/postfix/master.cf”

[root@localhost ~]# gedit /etc/postfix/master.cf

smtp      inet  n      -       n       -      -       smtpd  -o content_filter=spamassassin

spamassassin unix - n n  - - pipe user=nobody argv=/usr/bin/spamc -f /usr/sbin/sendmail -oi -f $(sender) -- $(recipient)  //追加到最后一行

3、重启postfix

[root@localhost openwebmail]# service postfix restart

关闭postfix：                                            [确定]

启动postfix：                                            [确定]

[root@localhost openwebmail]#

4、启动spam服务

[root@localhost ~]# service spamassassin start

启动spamassassin：                                            [确定]

[root@localhost ~]#

5、测试垃圾邮件。

1）spamassassin为我们提供了一个垃圾邮件的模板“sample-spam.txt”，我们可以使用此模板的内容来发送

[root@localhost openwebmail]# cat /usr/share/doc/spamassassin-3.3.1/sample-spam.txt 

Subject: Test spam mail (GTUBE)

Message-ID: <GTUBE1.1010101@example.net>

Date: Wed, 23 Jul 2003 23:30:00 +0200

From: Sender <sender@example.net>

To: Recipient <recipient@example.net>

Precedence: junk

MIME-Version: 1.0

Content-Type: text/plain; charset=us-ascii

Content-Transfer-Encoding: 7bit

 

This is the GTUBE, the

    Generic

    Test for

    Unsolicited

    Bulk

    Email

If your spam filter supports it, the GTUBE provides a test by which you

can verify that the filter is installed correctly and is detecting incoming

spam. You can send yourself a test mail containing the following string of

characters (in upper case and with no white spaces and line breaks):

 

XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X      //这就是垃圾邮件的内容

 

You should send this test mail from an account outside of your network.

2）使用openwebmail发信

3）查看邮箱的日志文件。Spam采用积分制，默认超过5分就是垃圾邮件，而我们看到下面识别出的邮件是999分，很明显是垃圾邮件

[root@localhost openwebmail]# cat /var/log/maillog

Aug 21 08:44:14 localhost spamd[6401]: spamd: failed to create readable default_prefs: //.spamassassin/user_prefs

Aug 21 08:44:14 localhost spamd[6401]: spamd: processing message <20180821004332.M42441@mailsrv.david.cn> for nobody:99

Aug 21 08:44:26 localhost spamd[6401]: spamd: identified spam (999.0/5.0) for nobody:99 in 12.5 seconds, 603 bytes.

Aug 21 08:44:26 localhost spamd[6401]: spamd: 

result: Y 999 – 

ALL_TRUSTED,GTUBE,TVD_SPACE_RATIO scantime=12.5,size=603,user=nobody,uid=99,required_score=5.0,rhost=localhost,raddr=127.0.0.1,

rport=33149,mid=<20180821004332.M42441@mailsrv.david.cn>,autolearn=no

Aug 21 08:44:26 localhost postfix/pipe[6443]: 3F2FD14141A: to=<david@mailsrv.david.cn>,

relay=spamassassin, delay=13, delays=0.06/0.03/0/12, dsn=2.0.0, status=sent (delivered via spamassassin service)

Aug 21 08:44:26 localhost postfix/qmgr[6368]: 3F2FD14141A: removed

Aug 21 08:44:26 localhost spamd[6399]: prefork: child states: II