Python BDD test cases for generated mails

Here I am trying to write a bdd test cases for emails. So in my case At my website we have a forgot password functionality So in this case while user click on forgot password link then we prompt a form with one input field. So in that input field we give a mail for generating an email to forgot passwords., So from email if user clicks on  link then our form will open for password reset. So here the main issue is  how to open that link using bdd python frame work.