method
    
    receive
 
  receive(raw_mail)
  public
  Receives a raw email, parses it into an email object, decodes it, instantiates a new mailer, and passes the email object to the mailer object’s receive method.
If you want your mailer to be able to process incoming messages, you’ll need to implement a receive method that accepts the raw email string as a parameter:
class MyMailer < ActionMailer::Base def receive(mail) # ... end end

 RSpec
RSpec Ruby on Rails
Ruby on Rails Ruby
Ruby 
   
   
   
    
     
    
    
 
  