Some months ago, i wrote an article to configure a Rails (1.2.x) application to use Gmail as Mail Server for the notifications.
The procedure was quite heavy at this time : we used msmtp , we should download Thawte Premium Server CA certificate (Gmail requires some security tunneling to authenticate via TLS), configure msmtp, and write a new msmt transport method in ActionMailer
Now it can be simpler, thanks to a plugin, released by Marc Chung, SMTP_TLS and made for Rails 2.0.
Thanks to this plugin, you just have to configure ActionMailer as you would do for a Mail server running on your deployment serve.
All the procedure is available here, on the blog of Daniel Fischer.
