Cai dat Postfix

### Cai dat Postfix
1.      # yum remove sendmail

2.      #yum install postfix* squirrelmail* dovecot* -y

3.      Cau hinh Postfix
                myhostname = mail.vnlamp.local
                mydomain = vnlamp.local
                myorigin = $myhostname
                inet_interfaces = all
                mydestination = $myhostname, $mydomain, localhost.$mydomain
                mynetworks_style = class
                mynetworks_style = subnet
                mynetworks_style = host
                mynetworks = 192.168.2.0/24, 168.100.189.0/28, 127.0.0.0/8

4.      Khoi dong cac dich vu
                #/etc/init.d/postfix restart
                #/etc/init.d/dovecot restart
                #/etc/init.d/httpd restart

5.      Tao 02 User va dat password
                #useradd mail01

6. Kiem tra mail server
                - Dung browser check webmail
                        http://192.168.2.x/webmail

### Cau hinh Header check
        - header_checks = regexp:/etc/postfix/header_checks ==> remove #
        - Tao file header_checks neu chua co
        - Rule header check
                + /^Subject:. *spam/ REJECT
                + /^From:. "spammer/ REJECT
                + /^To: mail01@vnlamp.local/ REDIRECT mail02@vnlamp.local
                + /^From:. *\@.*\.cn/
                + /^Received:. *netline.com/ REJECT Blacklisted
        - #postmap /etc/postfix/header_checks ==> chuyen tu file text thanh file db

### Cau hinh Body check
        - body_checks = regexp:/etc/postfix/body_checks ==> remove #
        - Tao file body_checks neu chua co
        - tao rule tu dong:
                + wget -O - http://www.malware.com.br/cgi/submit?action=list_postfix > /etc/postfix/body_checks
- #postmap /etc/postfix/body_checks ==> chuyen tu file text thanh file db

        Create File Update
                # vi /etc/postfix/update.sh
                #!/bin/bash
                # Script to update malware urls
                /usr/bin/wget -O - http://www.malware.com.br/cgi/submit?action=list_postfix > /etc/postfix/body_checks
                /usr/sbin/postmap /etc/postfix/body_checks
                /etc/init.d/postfix reload
                Add Crontad
                0 23 * * * /etc/postfix/update.sh >/dev/null 2>&1

### Chan file dinh kem
        - mime_header_checks = regexp:/etc/postfix/mime_header_checks
        - Tao file sender_access neu chua co
        - Rule sender_access:
                /name=[^>]*\.(doc|docx|txt|bat|com|exe|dll|vbs)/ REJECT
        - #postmap /etc/postfix/mime_header_checks

### Chan nguoi gui
        - smtpd_sender_restrictions =  check_sender_access hash:/etc/postfix/sender_access
        - Tao file sender_access neu chua co
        - Rule sender_access:
                test01@abc.local  REJECT
                test02@abc.com  OK
                abc.com            REJECT
        - #postmap /etc/postfix/sender_access