Actually from about six months ago it's possible to use your own FROM address and your own
SMTP server for outbound emails.
If you expand "I'm a Gmail or Google Apps user sending from an external address." then those
few steps give you a chance to enter an SMTP password for your server. It works brilliantly
and if your server isn't working then it's a couple of clicks to use Google's.http://mail.google.com/support/bin/answer.py?answer=22370
If you are using Google's webmail, then your outgoing emails will always use Google's
If you are using another client such as Outlook or Thunderbird, then you can use your own
servers for sending.