Installing Sendmail on the Mail Router

Prerequisites

Red Hat Linux
Windows 2000 Active Directory with Schema Extensions LDAP

Installation

Change localhost.localdomain in /etc/hosts to be something more representative of your domain and configuration.
Get Sendmail from sendmail.org.

mkdir sendmail cd sendmail ftp ftp.sendmail.org get pub/sendmail/sendmail.8.12.7.tar.gz ./sendmail.8.12.7.tar.gz

Unzip and untar sendmail.

cd sendmail gzip -d sendmail.8.12.7.tar.gz tar -xf sendmail.8.12.7.tar

Create a site.config.m4 file. This gives us LDAP support, SASL support for authentication, and MILTER support for our virus filtering.

cd sendmail-8.12.7/devtools/Site vi ./site.config.m4

APPENDDEF(`confENVDEF', `-DSASL') APPENDDEF(`confMAPDEF', `-DLDAPMAP') APPENDDEF(`conf_sendmail_LIBS', `-lsasl -lldap -llber') APPENDDEF(`confENVDEF', `-DMILTER')

Now we are going to build sendmail

cd ../../sendmail sh Build

Now we need to create our sendmail.mc file. Start with a generic mc file and and add the following entries to it.

cd ../cf/cf cp generic-linux.mc sendmail.mc vi sendmail.mc

OSTYPE(linux)dnl DOMAIN(generic)dnl FEATURE(`ldap_routing', `ldap -1 -T<TMPF> -v mailhost -k (&(objectClass=user)(EmailUID=%0))', `ldap -1 -T<TMPF> -v EmailUID -k (&(objectClass=user)(EmailUID=%0))', bounce)dnl FEATURE(`accept_unqualified_senders')dnl FEATURE(`accept_unresolvable_domains')dnl dnl this is going to be changed to LDAP soon FEATURE(`access_db', `hash -T<TMPF> /etc/mail/access.db')dnl FEATURE(`delay_checks')dnl FEATURE(`use_cw_file')dnl define(`confAUTH_MECHANISMS', `LOGIN')dnl define(`confTO_IDENT', `0s')dnl TRUST_AUTH_MECH(`LOGIN')dnl LDAPROUTE_DOMAIN(`yourdomain.com')dnl define(`confLDAP_DEFAULT_SPEC', `-h "192.168.0.1" -b "dc=yourdomain,dc=com" -d "cn=LDAPAuthUser,cn=Users,dc=yourdomain,dc=com" -M simple -P /etc/mail/password')dnl MAILER(local)dnl MAILER(smtp)dnl

Then we want to build the cf file

sh Build sendmail.cf sh Build install-cf

Create the user smmsp

useradd smmsp

Create the man directories

mkdir /usr/man mkdir /usr/man/man1 mkdir /usr/man/man5 mkdir /usr/man/man8

Install sendmail

cd ../../sendmail sh Build install

Compile makemap for the access.db. (Note: I seem to remember this being difficult, but don't remember exactly what the problem is/was. This will actually go away in future instructions because the access.db will be moved to LDAP.)

cd ../makemap sh Build sh Build install

Now modify the /etc/mail/access and make the access.db

makemap hash -v /etc/mail/access.db < /etc/mail/access /etc/rc.d/init.d/sendmail restart

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Disclaimer: I will not be held responsible for any problems encountered by following these instructions. This is informational only. Do not use this on a production system. Use at your own risk.