Set up a Sendmail server in Linux

Article Title: Set up a Sendmail server in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

Set up sendmail server

This time we will learn about the Sendmail server configuration in Linux. (The email server's IP192.168.1.2 host domain name is mail.ltest.com)

Premise: First we install the DNS server OK can resolve, do not understand Look At The http://www.cublog.cn/u/21675/showart_263507.html

1. install the software required for Sendmail.

[Root @ localhost ~] # Rpm-q sendmail m4

Sendmail-8.13.1-2

M4-1.4.1-16 has been installed by default, also need to mount 4th CDs, install software related to sendmail

[Root @ localhost RPMS] # rpm-ivh sendmail -*

Warning: sendmail-cf-8.13.1-2.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e

Preparing... ######################################## ### [100%]

1: sendmail-doc ##################################### ###### [33%]

2: sendmail-cf ##################################### ###### [67%]

3: sendmail-devel ##################################### ###### [100%]

2. Modify the/etc/mail/local-hosts-name file.

Add the FQDN of the local host and the local host. Remember to add only the FQDN of the local host and the domain name FQDN. Do not add other domains. Otherwise, the user unknown error will occur when sending emails to the external domain:

[Root @ localhost named] # cat/etc/mail/local-host-names

# Local-host-names-include all aliases for your machine here.

Ltest.com

3. Change the/etc/mail/sendmail. mc file and modify the following:

DaemonPortsOptions = Port = smtp, Addr = 127.0.0.1, Name = MTA changed:

DaemonPortsOptions = Port = smtp, Addr = yourip or 0.0.0.0, Name = MTA

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

4. User Management

Authentication configuration: Modify the fields in/etc/mail/sendmail. mc and cancel the comments at "TRUST_AUTH_MECH" and "define" in the next line. (In the 48th and 49 of the sendmail. mc files) Then m4/etc/mail/sendmail. mc>/etc/mail/sendmail. cf.

[Root @ localhost named] # chkconfig -- list saslauthd enable authentication

Saslauthd 0: off 1: off 2: off 3: off 4: off 5: off 6: off

[Root @ localhost named] # chkconfig -- level 35 saslauthd on

Create a user account

[Root @ localhost named] # groupadd mailuser

[Root @ localhost named] # adduser-g mailuser-s/sbin/nologin mike

[Root @ localhost named] # adduser-g mailuser-s/sbin/nologin john

[Root @ localhost named] # passwd mike

[Root @ localhost named] # passwd john password is 123

Set email alias and mass mailing

Modify the/etc/aliases file to implement Mail forwarding and Mail List:

Admin: mike sets the alias admin for the email user mike.

Testgroup: mike, john. Send the emails sent to testgroup by group to both mike and john.

# Newaliases

5. Access control settings

Change the/etc/mail/accesss file and add:

[Root @ localhost named] # cat/etc/mail/access

# Check the/usr/share/doc/sendmail/README. cf file for a description

# Of the format of this file. (search for access_db in that file)

# The/usr/share/doc/sendmail/README. cf is part of the sendmail-doc

# Package.

#

# By default we allow relaying from localhost...

Localhost. localdomain RELAY

Localhost RELAY

127.0.0.1 RELAY

Ltest.com RELAY

Then, makemap hash/etc/mail/access. db </etc/mail/access updates the database.

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