Centos + Sendmail + sasl2 + Dovecot

1. The centos, sasl2 package, and Sendmail package are installed by default; 2. Disable SELinux; otherwise, saslauthd will be affected by shadow authentication;

VI/etc/SELinux/config

Change SELinux = enforce to SELinux = disabled and restart the computer to take effect;

3. Modify the saslauthd configuration file and select the shadow authentication method;

VI/etc/sysconfig/saslauthd

Change mech = Pam to Mech = shadow;

4. Start saslauthd and verify if it works properly;

Service saslauthd start # Start saslauthd

Chkconfig saslauthd on # Set saslauthd to automatically start upon startup

Testsaslauthd-u username-P Password

If 0: OK "success." is displayed, saslauthd works normally;

5. Install sendmail-cf to configure the sendmail configuration file;

Yum install sendmail-cf

6. configure Sendmail. conf

VI/etc/mail/sendmail. MC

Delete the DNL starting with the following two rows:

Trust_auth_mech ('external DIGEST-MD5 CRAM-MD5 login plain ') DNL

Define ('confauth _ mechanisms ', 'external gssapi DIGEST-MD5 CRAM-MD5 login plain') DNL

# Configure the supported authentication methods. Users who pass verification after configuration can send emails without configuring relay in access.

Daemon_options ('port = SMTP, ADDR = 0.0.0.0, name = MTA ') DNL # modify the listening range

Daemon_options ('port = 587, name = MSA, M = A') DNL # add mail via port 587

M4/etc/mail/sendmail. MC>/etc/mail/sendmail. cf # generate the configuration

7. Add the domain name for Sendmail to receive emails;

VI/etc/mail/Local-host-names

Add a domain name such as an. Test // one line for each domain name

8. restart Sendmail and verify that Sendmail can be used properly;

Service Sendmail restart

Chkconfig Sendmail on

Telnet smtp_server 25

Helo domainname

250 domainname Hello [10.57.28.221], pleased to meet you

AUTH LOGIN

# Enter the username and password encoded in base64 and generate the following statement:

Perl-mmime: base64-e 'print encode_base64 ("word ")'

334 vxnlcm5hbwu6

Dgvzda ==# base64 encoded Test

334 ugfzc3dvcmq6

Ywjjzc4xmjm0 # base64 encoded abcd.1234

235 2.0.0 OK authenticated

Mail from: test@an.test

250 2.1.0 test@an.test... Sender OK

Rcpt to: test@an.test

250 2.1.5 test@an.test... Recipient OK

Data # Start email content

Subject: Test # mail title

This a test email. # Body of the email

. # End the email with one.

9. Install Dovecot to support pop3;

Yum install Dovecot

10. Configure Dovecot. conf

VI/etc/Dovecot. conf

Remove the # at the front of the following lines and modify them;

Protocols = IMAP POP3

Disable_plaintext_auth = No

Mail_location = mbox:/var/mail: inbox =/var/mail/% u

11. Start Dovecot;

Service Dovecot start

Chkconfig Dovecot on

12. Verify that POP3 can be used normally;

Telnet pop3_server 110

Auth

User user_name

Pass user_password

# After verifying OK, you can use POP3 to send and receive emails;