1.
Create User Account on Gmail.com.
2.
Check network setting for lookup/telnet
of smtp.gmail.com.
3.
Create local user for sending mail
through Gmail account to other mail account.
4.
Edit /etc/mail/sendmail.mc file and add
below parameters.
define(`SMART_HOST',
`smtp.gmail.com')dnl
define(`RELAY_MAILER_ARGS', `TCP $h
587')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h
587')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL
GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
FEATURE(`authinfo', `hash
/etc/mail/auth/client-info')dnl
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5
CRAM-MD5 LOGIN PLAIN')dnl
5.
Create “auth” folder.
# mkdir /etc/mail/auth
6.
Create “client-info” file and add below
paramters.
# vi /etc/mail/auth/client-info
AuthInfo:smtp.gmail.com "U:gmail_test_user"
"I:gmail_test_user@gmail.com" "P:gmail_test_user_password"
7.
Change folder location and create
database.
# cd /etc/mail/auth/
# makemap hash
client-info < client-info
8.
Change permission of file and folder.
# chmod 700 /etc/mail/auth
# chmod 600 /etc/mail/auth/*
9.
Compile configuration & restart
service.
# m4 /etc/mail/sendmail.mc >
/etc/mail/sendmail.cf
# service sendmail restart
10.
Finally, send a test mail.
# echo 'this is a test mail'| mail -s welcome_to_testmail
second_test_user@hotmail.com
11.
Check log message.
# tail -f /var/log/maillog
# tail –f /var/log/messages
