can any help me dealing with action mailer(plzzzzzzz with settings and full explanation)
What do you want to do, and what have you already tried? If you're getting an error message, please post it.
Have you looked "here":http://wiki.rubyonrails.org/rails/pages/ActionMailer ?
As Jon mentions above, the Ruby on Rails Wiki has an ActionMailer tutorial, at http://wiki.rubyonrails.org/rails/pages/ActionMailer.
There is a nice little chapter explaining ActionMailer, in the new version (Second printing) of "The Rails Way", by Obie Fernandez, et. al.
Of course, you can also refer to the ActionMailer class reference, at either http://am.rubyonrails.org/ or http://api.rubyonrails.org/classes/ActionMailer/Base.html. Some source code examples are included.