I'm really struggling with this. I'm trying to set up this server to send mail using Gmail's SMTP. Google keeps bouncing the messages, saying that that Authentication is required:

smtp.gmail.com[74.125.196.109]:25: 530-5.5.1 Authentication Required. Learn more at
smtp.gmail.com[74.125.196.109]:25: 530 5.5.1 http://support.google.com/mail/bin/answer.py?answer=14257

But it seems my server is trying to send mail as [email protected]. I'm baffled. Here's what I've done so far:

Updated mail.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

Created /etc/postfix/sasl_passwd:

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

Then did the following:

sudo chmod 400 /etc/postfix/sasl_passwd
sudo postmap /etc/postfix/sasl_passwd
cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | sudo tee -a /etc/postfix/cacert.pem
service postfix restart

I can't for the life me get a mail message to send, or change the default mail user from [email protected] to [email protected]

(FWIW, I'm using Google Apps, that's why it's not a .gmail address).