email relay

Most ISP mail servers require authentication. If yours does not then all you should need is the SMART_HOST entry in sendmail.mc

cd /etc/mail

edit sendmail.mc and add this before the MAILER entry:

define(`SMART_HOST',`smtpout.secureserver.net')
dnl smtpout.secureserver.net = your mail server name. Note: if an IP address is used, enclose the IP address with square brackets. dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')
FEATURE(`authinfo',`hash /etc/mail/auth/client-info')
dnl /etc/mail/auth/client-info = the absolute path to the auth file that you create dnl
define(`RELAY_MAILER_ARGS', `TCP $h 3535')
dnl 3535 = your mail servers port number. dnl

execute these commands:
mkdir auth
cd auth

create and edit a file client-info to look like this (one line):

AuthInfo:your.isp.net "U:root" "I:user" "P:password"

substitute only for:

your.isp.net = you mail relay host name
user = your mail username
password = the password that you use to check your mail.

execute these commands:
chmod 700 client-info
makemap hash client-info < client-info
cd ..
make
/sbin/service sendmail restart
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to test:
mail -s (subject) address

check the mail queue:
mailq -v

check log messages:
tail /var/log/maillog
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You can get a good mail relay account at namebub.com