class NotifyMail < ActionMailer::Base helper :mail def signup(txt) body(:name => txt) end def multipart recipients 'some_address@email.com' subject 'multi part email' from "another_user@email.com" content_type 'multipart/alternative' part :content_type => "text/html", :body => render_message("multipart_html", {}) part "text/plain" do |p| p.body = render_message("multipart_plain", {}) end end def implicit_multipart recipients 'some_address@email.com' subject 'multi part email' from "another_user@email.com" end end