class Mail::Message

end
end
p.part :content_type => "text/html", :body => "test HTML
\nline #2"
p.part :content_type => "text/plain", :body => "test text\nline #2"
part :content_type => "multipart/alternative", :content_disposition => "inline" do |p|
mail = Mail.new do

Example:

Allows you to add a part in block form to an existing mail message object

def part(params = {})
  new_part = Part.new(params)
  yield new_part if block_given?
  add_part(new_part)
end