如何生成遵循电子邮件应用程序格式的电子邮件？

Question

class PasswordsController < ApplicationController

  def edit
  end

  def update
    if current_user.update_with_password(user_params.merge(pw_changed: "true"))
      flash[:notice] = 'Your Password Has Been Sucessfully Updated.'
      redirect_to authenticated_root_path
    else
      flash[:error] = 'Oh No! Something Went Wrong, Please Try Again.'
      render :edit
    end
  end

  private
    def user_params
      param_key = current_user.class.model_name.param_key
      params.require(param_key)
            .permit(:current_password, :password, :password_confirmation)
    end
end

我已将电子邮件意图插入到我的活动中，但我生成的电子邮件不符合电子邮件格式。有没有办法让我的字符串触发电子邮件应用程序格式？请帮忙谢谢。