title: receiving email POP3 and save in DB
body: <p>I would like to continuously retrieve my emails via POP3 in my RoR-Projekt</p>
  
  <p>where and what should I have to set so that the mails are received.</p>
  
  <p>After that I have a table called "messages" with 
  string: "email", string: "subject" and text: "text"</p>
  
  <p>I would like to check if messages.email is the same like sender.of.email
  and
  messages.subject is the same like sender.of.email.subject
  if it is true save email text to  messages.text</p>
  
  <p>else
  delete email</p>
  
  <p>do that work with ActionMailer do i need a gem? how do that all work??</p>