I am using mailman server with pop3 configurations but i am stuck how can i check incoming email from subscribed channel ???
You're going to have to set up some sort of script on the mail server to send the mail into your Rails app, assuming (since you didn't say so) that that's what you're trying to do. More details here: http://guides.rubyonrails.org/action_mailer_basics.html#receiving-emails