Setting smtp relay di postfix
# apt-get update
#apt-get install postfix sasl2-bin libsasl2-2 libsasl2-modules
buat file
# nano /etc/postfix/sasl_passwd
lalu isi dengan
smtp.gmail.com youremail@gmail.com:yourpassword
# postmap hash:/etc/postfix/sasl_passwd
# chmod 600 /etc/postfix/sasl_passwd
# cp /etc/postfix/main.cf /etc/postfix/main.cf.backup
nano /etc/postfix/main.cf
relayhost = smtp.gmail.com:587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_security_options =
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/ssl/certs/Entrust_Root_Certification_Authority.pem
smtp_tls_session_cache_database = btree:/var/lib/postfix/smtp_tls_session_cache
smtp_tls_session_cache_timeout = 3600s
# postfix reload
# echo "test message" | mail -s "test subject" youremail@gmail.com
