[RoR][Sysadmin] ActiveMailer sending via GMail

On the previous Kansai Rails Conference in Asiyagawa somebody asked me about using GMail (smtp+ssl or tls) with Rails ActiveMailer. Didn't find solution until now but 'dza-dza-dzaaaaaaan' (hahaha i'm not so smart, all credits going to entombedvirus ):
Send email with ActionMailer through TLS only SMTP server

So for Debian (Ubuntu):

• Install msmtp (light SMTP client with support for server profiles)

$ sudo apt-get install msmtp

• Create/edit ~/.msmtprc

account gmail
host smtp.gmail.com
auth on
user <your_account>@gmail.com
password <your_password>
tls on
tls_starttls on
from <your_account>@gmail.com
maildomain gmail.com
account default : gmail

• Stop msmtp complaining about permissions

$ chmod 600 ~/.msmtprc

• Add on the bottom of yourrailsapp/config/environment.rb (and comment another ActionMailer::Base.delivery_method settings if exists) :

ActionMailer::Base.delivery_method = :msmtp

module ActionMailer
  class Base
    def perform_delivery_msmtp(mail)
      IO.popen("/usr/bin/msmtp -t -C /<path_to>/.msmtprc -a gmail --", "w") do
 |sm|
        sm.puts(mail.encoded.gsub(/\r/, ''))
        sm.flush
      end
    end
  end
end

Do not forget to fix the exact path to your .msmtprc in the source above.