Linux sendmail mail server Authentication and SSL configuration examples

1. SMTP AUTHENTICATION/CYRUS-SASL Configuration

1.1 Install CYLUS-SASL

1.2 Configure CYLUS-SASL to support SMTP authentication

1.2.1 CONFIGURE/ETC/MAIL/SENDMAIL.MC to support SMTP authentication:

Uncomment this:

Trust_auth_mech (' digest-md5 cram-md5 LOGIN PLAIN ') dnl

Define (' confauth_mechanisms ', ' GSSAPI digest-md5 cram-md5 LOGIN PLAIN ') dnl

...

Daemon_options (' port=smtp,addr=0.0.0.0, Name=mta,m=ea ') dnl

1.2.2 New/usr/lib/sasl2sendmail.conf:

[Root@host sasl2]# vi/usr/lib/sasl2/sendmail.conf

Pwcheck_method:saslauthd

1.3 Restart SASL and Check installation

Start SASL with Pam:

[Root@host sbin]# service SASLAUTHD stop

stopping SASLAUTHD: [OK]

[Root@host sbin]# saslauthd-a Shadow Pam

Test Installation:

[Root@host sasl2]# cat/usr/lib/sasl2/sendmail.conf

Pwcheck_method:saslauthd

[Root@host sasl2]# Service SASLAUTHD restart

stopping SASLAUTHD: [OK]

Starting SASLAUTHD: [OK]

[Root@host sasl2]# telnet mail.host.com 25

Trying 10.56.233.59 ...

Connected to Mail.host.com (192.168.1.5).

Escape character is ' ^] '.

host.com ESMTP Sendmail 8.13.8/8.13.8; Wed, Mar 2010 23:12:20 +0800

EHLO localhost

250-host.com Hello host [192.168.1.5], pleased to meet you

250-enhancedstatuscodes

250-pipelining

250-8bitmime

250-size

250-dsn

250-etrn

250-auth LOGIN PLAIN

250-deliverby

Help

Quit

221 2.0.0 host.com Closing connection

Connection closed by foreign host.

[root@host sasl2]# SENDMAIL-D0.1-BV Root | grep SASL

Netunix newdb NIS pipelining SASLv2 SCANF socketmap