Send Email from Rails 3 App with Sendmail server (Such as Exim4)

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 =)