```ruby
#!/usr/bin/env ruby -d

require 'mini-smtp-server'
require 'net/smtp'
require 'delayed_job_active_record'
require File.join(File.dirname(__FILE__), 'lib', 'mail_job')

# This is an SMTP server that logs all
# the messages it receives to STDOUT
class StdoutSmtpServer < MiniSmtpServer

  def new_message_event(message_hash)
    Delayed::Job.enqueue MailJob.new(message_hash)
  end

end

ActiveRecord::Base.establish_connection(
  :adapter => "sqlite3",
  :database  => "db/development.sqlite3"
)

# Create a new server instance listening at 127.0.0.1:2525
# and accepting a maximum of 4 simultaneous connections
server = StdoutSmtpServer.new(2525, "127.0.0.1", 4)

# Start the server
server.start

server.join
```

Load database config from standard rails place
user
```ruby
#!/usr/bin/env ruby -d

require 'mini-smtp-server'
require 'net/smtp'
require 'delayed_job_active_record'
require File.join(File.dirname(__FILE__), 'lib', 'mail_job')

# This is an SMTP server that logs all
# the messages it receives to STDOUT
class StdoutSmtpServer < MiniSmtpServer

  def new_message_event(message_hash)
    Delayed::Job.enqueue MailJob.new(message_hash)
  end

end

activerecord_config = YAML.load(File.read(File.join(File.dirname(__FILE__), 'config', 'database.yml')))

# Hardcoded to the development environment for the time being
ActiveRecord::Base.establish_connection(activerecord_config["development"])

# Create a new server instance listening at 127.0.0.1:2525
# and accepting a maximum of 4 simultaneous connections
server = StdoutSmtpServer.new(2525, "127.0.0.1", 4)

# Start the server
server.start
server.join
```
assistant