Action mailer receive email

I am following this rails guide http://guides.rubyonrails.org/action_mailer_basics.html#receiving-emails. But i am not able to understand what should it means “Configure your email server to forward emails from the address(es) you would like your app to receive to /path/to/app/bin/rails runner 'UserMailer.receive(STDIN.read)'.” Is there any screen-cast which explain these things ???

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receive to |/path/to/app/bin/rails runner 'UserMailer.receive(STDIN.read)'|. where i should run this command and where define outgoing server configuration ???

This totally depends on which MTA/MUA you are using, you need to configure it in the MTA/MUA you are using and how you do it totally depends on the software uised. Perhaps someone else is able to help you after you have provided necessary information.

which is completely irrelevant to the question of *receiving* mail...

good point, deleted the post.