Details about how to build the sendmail server

I like Suse very much. I also like to sum up the Suse experience and lessons at work. Let's talk about this in detail. The original intention of this article is to read that the sendmail server is complex. In order to configure the sendmail server more concisely and concisely, I hope it can help you learn.

Step 1: Install the Sendmail server

(1) run the rpm command to install Sendmail. install cyrus-sasl, sendmai, and sendmail-cf software packages in RHLE5 with system-config-packages, which are cyrus-sasl-2.1.22-4.i386, sendmail-8.13.8-2.e15.i386, and sendmai-cf-8.13.8-2.e15.i386; install sendmail in RHEL4, the sendmail-cf and sendmail-doc packages are recommended.

(2) domain name settings:

1. Add an MX record to the DNS server
@ In mx 5 mail.test.com
Mail.test.com in a 192.168.1.102

2. Set the local-host-names file vi/etc/mail/local-host-names // to add the domain name that the email server provides services.
Test.com

3. enable the network interface vi/etc/mail/Sendmail. mc of the sendmail server.

// Search for the set row
DAEMON_OPTIONS ('port = smtp, Addr = 127.0.0.1, Name = MTA ') dn1 changes 127.0.0.1 to 0.0.0.0
// Even if the server can provide services for all network interfaces of the host (0.0.0.0)

(3) Configure SMTP authentication for Senmail
Vi/etc/mail/sendmail. mc
// Search for the set row
Dnl TRUST_AUTH_MECH ('external DIGEST-MD5 login plain ') dnl
Dnl define ('confauth _ MECHANISMS ', 'external GSSAPI DIGEST-MD5 CRAM-MD5 login plain') dnl

Remove the dnl of the two rows // in the sendmail File, dnl indicates that the behavior comment line is invalid. Therefore, you can enable the corresponding setting line by removing the dnl string at the beginning of the line.

* In RHEL4 * 5, the sendmail. conf configuration file uses the saslauthd service program to provide the user's authentication level. Therefore, the sasaauthd service must be started.

(4) access Control Configuration. In RHEL4 & 5, by default, users of the host where the Sendmail server is located can send emails without any authentication.

Note that the/etc/mail/access file contains a line: 127.0.0.1 RELAY // RELAY is a RELAY, I suggest using Yi Ma to understand the meaning of this sentence.
Makemap hash access. db database file

(5) run the m4 command to generate the sendmail. cf file. In fact, sendmail. mc is a template file.
M4 sendmail. mc> sendmail. cf
Start the Sendmail and saslauthd services and verify the Sendmail services.
Telnet localhost 25 // enter ehlo localhost. At this time, login plain should be entered, indicating that SMTP authentication is successfully set.
Chkconfig -- level 35 saslauthd on
Service saslauthd start

Step 2: configure the Dovecot Server

Run the system-config-packages command to install the dovecot package, vi/etc/dovecot. conf.

Remove the one before # protocols = imap imaps pop3 pop3s. Add pop3 and pop3s to RHEL4.

Start dovecot service dovecot start

Step 3: Start the DNS, saslauthd, and sendmail. dovecot services for testing.

After completing the above steps, you can build a sendmail system. After reading this article, I hope you will gain some benefits and quickly complete the establishment of the sendmail server.

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