sendmailer
Send Email from Rails 3 App with Sendmail server (Such as Exim4)
Usage
Gemfile
gem "sendmailer"
Install and configure Exim4 in your Linux:
sudo aptitude install exim4
sudo dpkg-reconfigure exim4-config
All answers (for example) here: http://library.linode.com/email/exim/send-only-mta-debian-6-squeeze
And now you can send mail immediately from your localhost sendmail server. It's very fast. Google нервно курит в сторонке =)