Installing Postfixyum install postfix mailx cyrus-sasl-plain ConfiguringCreate a password file so that Postfix can authenticate to Gmail's servers. Create a file named sasl_passwd in /etc/postfix. Replace smtp_user and smtp_passwd with their respective values. echo "smtp.gmail.com smtp_user:smtp_passwd" > /etc/postfix/sasl_passwd
Then hash that file so that the password is not stored in clear text. This command will create a file named sasl_passwd.db in the /etc/postfix/ directory.
postmap hash:/etc/postfix/sasl_passwd
You can, and should delete the sasl_passwd file now.
After that is done, add these to the bottom of /etc/postfix/main.cf. This is assuming that your root certificates installed from openssl are located in /etc/pki/tls/certs/ca-bundle.crt.
smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous # Secure channel TLS with exact nexthop name match. smtp_tls_security_level = secure smtp_tls_mandatory_protocols = TLSv1 smtp_tls_mandatory_ciphers = high smtp_tls_secure_cert_match = nexthop smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt relayhost = smtp.gmail.com:587
After that is done, restart postfix: service postfix restart
Send a test mail: echo "Test mail from Postfix" | mail -s "Mail from Postfix" johann.maxen@gmail.com echo "Test mail from Postfix" | mail -s "Mail from Postfix" johann.swart@up.ac.za
Both should work if all went well. REMEMBER TO CHECK SPAM FOLDERS!!!!
To debug:
tail /var/log/maillog
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