You Have Mail

If you&rsquo;ve ever logged in to a FreeBSD system, you have certainly seen the line &ldquo;you have mail&rdquo; . &#xA;No big deal might one say, it simply tells the user that there is mail to be read. &#xA;Indeed, that is the case&hellip; but have you maybe wondered how that is possible? &#xA;After all, it must come from somewhere, right ?! &#xA; Where to begin? &#xA; First of all, there must be…