create a mailer to send a email when receive a new contact

app/mailers/application_mailer.rb

 class ApplicationMailer < ActionMailer::Base
   default from: 'from@example.com'
-  layout 'mailer'
+  #layout 'mailer'
 end

app/mailers/contacts_mailer.rb

+class ContactsMailer < ApplicationMailer
+
+    def new_contact_received(contact)
+        @contact = contact
+        @subject = "Contato de " + @contact.name 
+        mail(to: 'marcelaribeirooliveira@gmail.com' , subject: @subject)
+    end
+end