Kirim EMail dari Linux CentOS 7 (postfix)

1.  Update OS
   sudo yum update -y
   
   
2. Install Postfix dan Mailx
   sudo yum install -y postfix cyrus-sasl-plain mailx
   
   
3. Configure Postfix
   sudo vi /etc/postfix/main.cf
   
   Tambahkan config berikut :
   relayhost = [smtp.gmail.com]:587
   smtp_use_tls = yes
   smtp_sasl_auth_enable = yes
   smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
   smtp_sasl_security_options = noanonymous
   smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt
   
   
   Create file 'sasl_passwd' : 
   sudo nano /etc/postfix/sasl_passwd
   
   isi file tersebut dengan teks berikut :
   [smtp.gmail.com]:587 youremail@gmail.com:yourpassword
   
   
   
4. Amankan Credentials dan Update Postfix
   Atur owner dan file permission :
   sudo chown root:root /etc/postfix/sasl_passwd
   sudo chmod 600 /etc/postfix/sasl_passwd
   sudo postmap /etc/postfix/sasl_passwd
   
   Restart dan enable Postfix :
   sudo systemctl restart postfix
   sudo systemctl enable postfix
   
   
5. Ujicoba kirim email via smtp google
   echo "This is a test email" | mailx -s "Test Email Subject" recipient@example.com

Sumber : this website