```ruby
# Silverpop
require 'net/http'
require 'net/ftp'
require 'uri'
require 'nokogiri'

require File.dirname(__FILE__) + '/silverpop/base'
require File.dirname(__FILE__) + '/silverpop/engage'
require File.dirname(__FILE__) + '/silverpop/transact'
require File.dirname(__FILE__) + '/silverpop/silverpop_mailer'
```

Remove additional reference to SilverpopMailer
user
```ruby
# Silverpop
require 'net/http'
require 'net/ftp'
require 'uri'
require 'nokogiri'

require File.dirname(__FILE__) + '/silverpop/base'
require File.dirname(__FILE__) + '/silverpop/engage'
require File.dirname(__FILE__) + '/silverpop/transact'
```
assistant