Ruby on Rails Mailer not sending email in development mode -

I have a Rail application with a normal mailer that looks like this:

  class Event Myeler & lt; ActionMailer :: Base default: "example.com" def welcome_email (event, customer) @ event = event @ customer = customer mail: subject => "Test" ,:: from = & gt; @ Customer interval end   
 My action_mailer settings look like this:  
  config.action_mailer.smtp_settings = {: address = & gt; "Smtp.mandrillapp.com" ,: port = & gt; 587, # Ports 587 and 2525 are also supported with STARTTLS: enable_starttls_auto = & gt; True, # detects and uses STARTTLS: user_name = & gt; "My_email" ,: Password = & gt; "My_password", # SMTP Password is any valid API key: authentication = & gt; 'Login', # Mandrill support 'Plain' or 'Login': Domain = & gt; 'Yourdomain.com', # to identify your server while connecting your domain}   
 I have a customer registration and it sends an email right away. But when I try to run in my console:  
  EventMailer.welcome_email (Event.last, Customer.last). Deliver   
 This email does not deliver. What could be wrong? I have no idea ...  
 EDIT: My remaining configuration  
  config.action_mailer.default_url_options = {: host = & gt; 'Localhost: 3000'} config.action_mailer.delivery_method =: smtp config.action_mailer.perform_deliveries = true config.action_mailer.raise_delivery_errors = true    
 
 
 Mail has not been sent to the development by default, to enable it, you should zoom your  development.rb  in this way:  <  config.action_mailer.perform_deliveries = true   
 You  
  UPDATE   
 This  By default  thereby providing invalid e-mail.