RailsMailPreview, will preview your email along with any attachments that are sent. This gives you an idea of what will be sent.
Available for Download FREE from the Mac App Store: http://itunes.apple.com/us/app/railsmailpreview/id474232890?mt=12
Make sure to install the "rails_mail_preview" gem into your Rails web app.
http://nufex.com/rails-mail-preview
