Configuring Postfix as a Gmail Relay

This document describes how to configure postfix to use gmail as relay server on debian squeeze.

1. Install the required package. On the dialog window please select No configuration.

apt-get install postfix libsasl2-2 ca-certificates libsasl2-modules

2. Configure postfix

vim /etc/postfix/main.cf

relayhost = [smtp.gmail.com]:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_tls_CAfile = /etc/postfix/cacert.pem
smtp_use_tls = yes
alias_maps = hash:/etc/aliases
inet_interfaces = 127.0.0.1

:wq

3. Define an username and a password

vim /etc/postfix/sasl_passwd

[smtp.gmail.com]:587 email@gmail.com:password

:wq

4. Fix file permissions

chmod 400 /etc/postfix/sasl_passwd

5. Generate Postix lookup table

postmap /etc/postfix/sasl_passwd

6. Use the ca-certificate package we installed and tell it where it can validate the certificate

cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | tee -a /etc/postfix/cacert.pem

7. Restart postfix

/etc/init.d/postfix restart

8. Test installation

echo "Test from a postfix configured to use gmail as a relay server" | mail -s "Test from postfix" "email@example.com"

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