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	SENDMAIL en RHEL4

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#vi /etc/mail/local-host-names
 # Domains from where we *get* emails
 mydomain.com
 mail.mydomain.com
 email.mydomain.com

#cp /etc/mail/sendmail.mc /etc/mail/sendmail.mc.default

#vi /etc/mail/sendmail.mc 
Comment:
 dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
 dnl FEATURE(`accept_unresolvable_domains')dnl
We set the domain name here: *mydomain.com*
 MASQUERADE_AS(mydomain.com)dnl

From where is it possible to send emails:
#vi /etc/mail/relay-domains
 mydomain.com
 mail.mydomain.com
 email.mydomain.com
 190.40.95.95

Set who can *mail relay*
#vi /etc/mail/access 
192.168.1.2			RELAY
192.168.1.3			RELAY
192.168.1.4			RELAY
192.168.1.243			RELAY

Compile
#cd /etc/mail
#make

#vi /etc/aliases
# Person who should get root's mail
 root:		hugomartin

#/sbin/newaliases
#/sbin/service sendmail restart
#/sbin/chkconfig --level 345 sendmail on
#/sbin/iptables -t filter -A INPUT -p tcp -s 0/0 -d 0/0 --dport 25 -j ACCEPT

SETTING POP3, IMAP
==================
# vi /etc/dovecot.conf
 protocols = imap pop3
NOTE: Sometimes this is necessary for IPv4:
 imap_listen = *
 pop3_listen = *

#/sbin/chkconfig dovecot on
#/sbin/service dovecot start


MAIL-RELAY
==========
#vi /etc/mail/sendmail.cf

    # "Smart" relay host (may be null)	
    DS<ip-address to relay>			<--- search for DS

-> restart sendmail.



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by Eng. Hugo Martin C. V. (SCNP)		2006 (cc) www.hackcraft.com 

Source: http://www.linuxparatodos.net/geeklog/staticpages/index.php?page=14-como-sendmail-corporativo