```ruby
require "fileutils"
require "digest/sha1"
require "cgi"

require "letter_opener/message"
require "letter_opener/delivery_method"
require "letter_opener/railtie" if defined? Rails
```

Add a require on launchy
user
```ruby
require "fileutils"
require "digest/sha1"
require "cgi"
require "launchy"

require "letter_opener/message"
require "letter_opener/delivery_method"
require "letter_opener/railtie" if defined? Rails
```
assistant