Setup Postfix Ubuntu Gmail SMTP Relay

Refer to http://ubuntu-tutorials.com/2008/11/11/relaying-postfix-smtp-via-smtpgmailcom/

On clean Ubuntu (natty) 11.04 (with ssh and aptitude installed, and as root)

aptitude install postfix libsasl2 ca-certificate libsasl2-modules

During Postfix Configuration Package configuration wizard
On first page, choose "Internet with smarthost"
For SMTP relay host enter: [smtp.gmail.com]:587
(brackets are to avoid mx lookups)

paste in /etc/postfix/main.cf:

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/Equifax_Secure_CA.pem
smtp_use_tls = yes

while still in main.cf, add your local IP network to the mynetworks variable

create /etc/postfix/sasl_passwd with the following contents:

[smtp.gmail.com]:587 user.name@gmail.com:password

do:

chmod 400 /etc/postfix/sasl_passwd
postmap /etc/postfix/sasl_passwd

/etc/init.d/postfix reload

Now test:

telnet postfixserverip 25
ehlo anything.com
mail from:me@whatever.com
rcpt to:someone@somewhere.com notify=success,failure
data
subject:Test from awgtek

This is a test message

.
quit

check someone@somewhere.com's email to see if message arrived
check for errors in /var/log/mail.log