configure gmail as relay smtp using postfix

configure-gmail-as-relay-smtp

Steps to configure this server to send mail via gmail relay

1. Download postfix and required packages 
     sudo apt-get install postfix mailutils libsasl2-2 ca-certificates libsasl2-modules
2. Configure gmail as relay host : in /etc/postfix/main.cf
     relayhost = [smtp.gmail.com]:587
     smtpd_sasl_auth_enable = yes
     smtp_sasl_auth_enable = yes
     smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
     smtp_sasl_security_options = noanonymous
     smtp_sasl_tls_security_options = noanonymous
     smtp_tls_CAfile = /etc/postfix/cacert.pem
     smtp_use_tls = yes
4. Write in /etc/postfix/master.cf
   10025 inet n -n - - smtpd
3. Stock gmail username and password in /etc/postfix/sasl_passwd, 
give 400 access rights + add to postmap
     write :
              [smtp.gmail.com]:587 username@gmail.com:password
	      smtp.gmail.com username@gmail.com:password
	      gmail-smtp.l.google.com username@gmail.com:password
     to /etc/postfix/sasl_passwd
     sudo chmod 400 /etc/postfix/sasl_passwd
     sudo postmap /etc/postfix/sasl_passwd
4. Create certificate file
     cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | sudo tee -a /etc/postfix/cacert.pem
5. Finally, reload postfix : 
     service postfix restart

For testing : 
      echo "test email from postfix | mail -s "subject" destination@xyz.com