Details about installing the mail system Postfix + CyrusSASL + dovecot in RHEL5

By default, RHEL5 is installed without selecting any types of servers (such as WEB servers, development servers, and virtual servers) to install postfix [root @ rhel5 ~] #/Etc/rc. d/init. d/sendmailstop close sm-client: [OK] Disable sendmail: [OK] [root @ rhel5 ~] # Chkconfigsendmailoff [root @ rhel5Server] # RHEL5 is installed in rpm-I by default, and no type of server is selected (such as WEB server, development server, and virtual server)

Install postfix

[Root @ rhel5 ~] #/Etc/rc. d/init. d/sendmail stop

Close sm-client: [OK]

Disable sendmail: [OK]

[Root @ rhel5 ~] # Chkconfig sendmail off

[Root @ rhel5 Server] # rpm-ivh postfix-2.3.3-2.i386.rpm

[Root @ rhel5 Server] # vi/etc/postfix/main. cf

Myhostname = mail.mailidc.cn # Set the Host Name and domain name of the email host running the postfix Service

Mydomain = mailidc.cn

Myorigin = $ mydomain # Set the domain name or Host Name of the mail sent by the Local Machine

Inet_interfaces = all # Set the network interface of the postfix service listener

Mydestination = $ myhostname, $ mydomain, localhost. $ mydomain, localhost # Set the host name or domain name for receiving emails

Mynetworks = 127.0.0.1 # sets which network mails can be forwarded

Relay_domains = $ mydestination # sets which domains can forward emails

Save the file.

Check the postfix Configuration:

[Root @ rhel5 Server] # postconf-n

[Root @ rhel5 ~] # Chkconfig postfix on

Add postfix to the root group:

# Usermod-G root postfix

SMTP authentication Configuration

Install cyrus-sasl

1. Check whether cyrus-sasl is installed.

[Root @ rhel5 Server] # rpm-qa | grep cyrus

Cyrus-sasl-plain-2.1.22-4

Cyrus-sasl-lib-2.1.22-4

Cyrus-sasl-2.1.22-4

Password Verification Mechanism Of Cyrus-SASL V2

[Root @ rhel5 ~] # Saslauthd-v

Saslauthd 2.1.22

Authentication mechanisms: getpwent implements os5 pam rimap shadow ldap

We are going to use the password verification mechanism of shadow.

Vi/etc/sysconfig/saslauthd

MECH = shadow

Start daemon of sasl and test:

# Service saslauthd start

#/Usr/sbin/testsaslauthd-u account-p 'Password'

0: OK "Success." => the account has been verified successfully.

[Root @ rhel5 ~] # Chkconfig saslauthd on

Set postfix to enable SMTP authentication

[Root @ rhel5 Server] # vi/etc/postfix/main. cf

Smtpd_sasl_auth_enable = yes

Smtpd_sasl_local_domain =''

Smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated,

Reject_unauth_destination

Broken_sasl_auth_clients = yes

Smtpd_client_restrictions = permit_sasl_authenticated

Smtpd_sasl_security_options = noanonymous

Wq! Save


In addition, when postfix requires SMTP authentication, it will read/usr/lib/sasl2/smtpd. the content of the conf file is used to determine the authentication method used. Therefore, the/usr/lib/sasl2/smtpd must be ensured. the content of the conf file is:

Pwcheck_method: saslauthd