1.配置 linux5 为 mail 服务器，安装 postfix 和 dovecot。 2.仅支持 smtps 和 pop3s 连接。 3.创建用户 mail1 和 mail2，向 all@skills.com 发送的邮件，每个用户都会收到。 4.使用 s-nail 在本机进行测试。
- 安装相关软件包
yum install -y postfix* dovecot* s-nail
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/etc/postfix/master.cf
vim /etc/postfix/master.cf
16 #tlsproxy unix - - n - 0 tlsproxy
17 submission inet n - n - - smtpd
18 -o syslog_name=postfix/submission
19 -o smtpd_tls_security_level=encrypt
20 -o smtpd_sasl_auth_enable=yes
21 -o smtpd_tls_auth_only=yes
22 # -o smtpd_reject_unlisted_recipient=no
23 # -o smtpd_client_restrictions=$mua_client_restrictions
24 # -o smtpd_helo_restrictions=$mua_helo_restrictions
25 # -o smtpd_sender_restrictions=$mua_sender_restrictions
26 # -o smtpd_recipient_restrictions=
27 -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
28 # -o milter_macro_daemon_name=ORIGINATING
29 smtps inet n - n - - smtpd
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/etc/postfix/mian.cf
95 myhostname = linux5.skills.com
102 mydomain = skills.com
118 myorigin = $mydomain
132 inet_interfaces = all
138 inet_protocols = all
183 #mydestination = $myhostname, localhost.$mydomain, localhost
184 #mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
185 mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain,
186 mail.$mydomain, www.$mydomain, ftp.$mydomain
270 mynetworks_style = host
282 mynetworks = 10.10.120.0/24
708 smtpd_tls_cert_file = /etc/ssl/skills.crt
714 smtpd_tls_key_file = /etc/ssl/skills.key
730 smtp_tls_CAfile = /etc/ssl/cacert.pem
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/etc/dovecot/conf.d/
[root@linux5 conf.d]# vim 10-auth.conf
10 disable_plaintext_auth = yes
[root@linux5 conf.d]# vim 10-mail.conf
24 mail_location = maildir:~/Maildir
25 # mail_location = mbox:~/mail:INBOX=/var/mail/%u
26 # mail_location = mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n
[root@linux5 conf.d]# vim 10-ssl.conf
14 ssl_cert = </etc/ssl/skills.crt
15 ssl_key = </etc/ssl/skills.key
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- 将Linux1的证书导入到/etc/ssl中
[root@linux1 ~]# scp /etc/pki/CA/skills.* linux5.skills.com:/etc/ssl
skills.crt 100% 4401 3.1MB/s 00:00
skills.csr 100% 1005 829.2KB/s 00:00
skills.key 100% 1704 1.3MB/s 00:00
skills.pfx 100% 2691 3.0MB/s 00:00
[root@linux1 ~]# scp /etc/pki/CA/cacert.* linux5.skills.com:/etc/ssl
cacert.pem
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- 添加别名
[root@linux5 conf.d]# vim /etc/aliases
91 all: mail1,mail2
[root@linux5 conf.d]# newaliases
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- 添加用户
useradd mail1
useradd mail2
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- 重启服务
[root@linux5 conf.d]# systemctl restart dovecot postfix
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- 发送邮件给all 查看mail1 mail2邮箱
[root@linux5 conf.d]# echo "Hello"|mail -s "Welcome" all@skills.com
[root@linux5 conf.d]# mail -u mail1
s-nail version v14.9.22. Type `?' for help
/var/spool/mail/mail1: 1 message 1 new
▸N 1 root 2024-06-07 09:54 15/444 "Welcome "
& 1
[-- Message 1 -- 15 lines, 444 bytes --]:
Date: Fri, 07 Jun 2024 09:54:28 +0800
To: all@skills.com
Subject: Welcome
Message-Id: <20240607015428.6ED2DBE67A@linux5.skills.com>
From: root <root@skills.com>
Hello
& quit
Held 1 message in /var/spool/mail/mail1
[root@linux5 conf.d]# mail -u mail2
s-nail version v14.9.22. Type `?' for help
/var/spool/mail/mail2: 1 message 1 new
▸N 1 root 2024-06-07 09:54 15/444 "Welcome "
& 1
[-- Message 1 -- 15 lines, 444 bytes --]:
Date: Fri, 07 Jun 2024 09:54:28 +0800
To: all@skills.com
Subject: Welcome
Message-Id: <20240607015428.6ED2DBE67A@linux5.skills.com>
From: root <root@skills.com>
Hello
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