Using google app engine instead of sending mail via gmail
I haven't used gmail with PHPMailer, but I don't think it is foolish. But if you ask me you are better of using google app engine to send emails. I realize this isn't a php solution, but I think to achieve what you want the google app engine documentation will fit your bill. That way you don't have the hard limit enforced on you and it scales very well.
P.S: Google has a very generous free daily
quota:
Mail API Calls 7,000 calls, 32
calls/minute
Learn basics of deploying an application to google app engine
Also a little youtube video from Slatkin(<10 minutes) to learn the basics of deploying a app to Google App engine. When I saw this video I was sold to the power of app engine and python.
Send email via Python's app engine SDK
Here you will find a little snippet which I directly copied from there documentation.
from google.appengine.api import mail
mail.send_mail(sender="Example.com Support <[email protected]>",
to="Albert Johnson <[email protected]>",
subject="Your account has been approved",
body="""
Dear Albert:
Your example.com account has been approved. You can now visit
http://www.example.com/ and sign in using your Google Account to
access new features.
Please let us know if you have any questions.
The example.com Team
""")