详细介绍如何在一台CentOS平台sendmail的imap,pop3,smtp认证配置

中存储chinastor.cn分享CentOS平台sendmail的imap,pop3,smtp认证配置方法

首先，安装邮件服务器

yum install sendmail sendmail-cf

安装pop3/imap服务

yum install dovecot 

安装用户认证

yum install cyrus-sasl

yum install cyrus-sasl-md5

yum install cyrus-sasl-plain

yum install cyrus-sasl-lib

修改sendmail配置

vi /etc/mail/sendmail.mc

第42行和43行，把最前面的dnl删除，变成:

TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl  

define(`confAUTH_MECHANISMS',`EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl 

修改SMTP的监听IP为 0.0.0.0  

DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA')dnl

生成配置

m4 /etc/mail/sendmail.mc > /etc/sendmail.cf

***************************

如果出现：sendmail.mc:10: m4: cannot open `/usr/share/sendmail-cf/m4/cf.m4': No such file or directory

说明需要安装sendmail-cf

yum install sendmail-cf

***************************

修改dovecot配置

vi /etc/dovecot.conf

去掉下面一行前面的#

#protocols =imap imaps pop3 pop3s

添加域名

vi /etc/mail/local-host-names

添加域名如:dirtysea.com //每个域名一行

修改认证方式 

vi /usr/lib/sasl2/Sendmail.conf 里面指明了：pwcheck_method=saslauthd，不做修改

vi /etc/sysconfig/saslauthd  找到第7行的：MECH=  改成：MECH=shadow

保存

如下示列：

[chinastor.cn-root@mail]# cat /usr/lib/sasl2/Sendmail.conf

pwcheck_method:saslauthd

[chinastor.cn-root@mail]# cat /usr/lib/sasl2/smtpd.conf.rpmsave 

log_level: 3  

pwcheck_method: saslauthd 

mech_list: PLAIN LOGIN

[chinastor.cn-root@mail]# cat   /etc/sysconfig/saslauthd

# Directory in which to place saslauthd's listening socket, pid file, and so

# on.  This directory must already exist.

SOCKETDIR=/var/run/saslauthd

# Mechanism to use when checking passwords.  Run "saslauthd -v" to get a list

# of which mechanism your installation was compiled with the ablity to use.

MECH=shadow

# Additional flags to pass to saslauthd on the command line.  See saslauthd(8)

# for the list of accepted flags.

FLAGS=

[chinastor.cn-root@mail]#testsaslauthd -u test -p 123456   (验证smtp)

0: OK "Success."

添加邮件用户

[chinastor.cn-root@localhost named]# groupadd mailuser 

[chinastor.cn-root@localhost named]# adduser -g mailuser -s /sbin/nologin test 

这样添加的用户名就没有了shell,只能收发信而不能登录到服务器运行其他程序

设置开机启动

chkconfig sendmail on

chkconfig dovecot on

chkconfig saslauthd on

重启

service sendmail restart

service dovecot restart

service saslauthd restart

验证Sendmail服务

telnet localhost 25 //输入helo localhost 此时应该有LOGIN PLAIN的字样，即表示SMTP认证设置成功。

[chinastor.cn-root@centos5 mail]# telnet localhost 25

Trying 127.0.0.1...

Connected to localhost.localdomain (127.0.0.1).

Escape character is '^]'.

220 centos5 ESMTP Sendmail 8.13.8/8.13.8; Thu, 6 May 2010 06:21:29 +0800

helo localhost

250 centos5 Hello localhost.localdomain [127.0.0.1], pleased to meet you

mail from:<>

250 2.1.0 <>... Sender ok

rcpt to:<>       (要测试向外发送邮件就填写网络上存在的邮件地址)

250 2.1.5 <>... Recipient ok

data

354 Enter mail, end with "." on a line by itself

From: alin 

To: alin 

Subject: Hello 

test

.

250 2.0.0 o45MLTcH005157 Message accepted for delivery

quit

221 2.0.0 centos5 closing connection

Connection closed by foreign host.

ok，可以使用outlook或foxmail进行测试收发了。

注意：为什么没有设定foxmail中的smtp服务器需要验证，也可以发送E-mail? 

要用OUTLOOK来测试，Foxmail似乎可以自动地进行smtp认证。OUTLOOK在smtp服务器验证失败后，有拒绝提示

工具->;帐户->;邮件->;属性->;服务器->;我的服务器要求身份验证(选上)->;设置->;(选择)登录方式->;帐户名:(用saslpasswd2建立的),密码(用saslpasswd2建立的)->;确定.

另外：接收邮件服务器的帐户名与密码应该是系统里的用户名与密码.

saslauthd -v 看结果支不支持 pam或shadow

smtp验证测试： testsaslauthd -u test -p 123456 

sasldblistusers2 检查已经增加的smtp验证用户

saslpasswd2增加smtp验证用户：saslpasswd2 -u cencn.com -c test

查看sendmail队列：mailq

立即发送队列里的邮件：  sendmail –oQ/var/spool/mqueue.stop -q

察看邮件系统的状态：mailstats

查看暂时存储邮件：ls -l /var/spool/mail |more

获取更多邮件服务器知识请访问中存储的邮件服务器专栏。

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