mail catcher for rails env

test_mail_catcher.rb

if Rails.env.test?
  
  class MailCatcher
    def self.create(opts)
      File.open("#{Rails.root}/tmp/mailcatcher/mail-#{Time.now.to_i}.html", 'w') do |f| 
        f.write(opts[:body].raw_source) 
      end
    end
  end

  module ActionMailerCatcher

    module InstanceMethods
      def send_with_mail_catch!(opts={})
          send_without_mail_catch!(opts)
          logger.info "STORING MAIL IN MONGO!"
          MailCatcher.create(
            :from=>         @_message.from , 
            :to=>           @_message.to, 
            :body=>         @_message.body , 
            :content_type=> @_message.content_type ,
            :subject=>      @_message.subject,
            :reply_to=>     @_message.reply_to
          ) if MailCatcher

      end
    end

    def self.included(receiver)
      receiver.send :include, InstanceMethods
      receiver.class_eval do
        alias_method_chain :send!, :mail_catch
      end
    end
  end

  BaseMailer.send :include, ActionMailerCatcher

end

create file in:

config/initializers

create folder in tmp:

tmp/mailcatcher