title: Allow dovecot external login
body: <p>I currently have <code>dovecot</code> and <code>postfix</code> set up, and I can log in locally because <code>rainloop web mail</code> works perfectly fine for both sending and receiving. However, all external login attempts simply fail, even with the correct username and password. How can I allow external logins(any config file changes, etc.)? </p>
  
  <p>Please let me know about any error logs that might help, and I'll add them to this question.</p>