Random email.

    Usage Example::
    
        >>> rand_email()
        Z4Lljcbdw7m@npa.net

def rand_email():
    """Random email.

    Usage Example::
    
        >>> rand_email()
        Z4Lljcbdw7m@npa.net
    """
    name = random.choice(string.ascii_letters) + \
        rand_str(string.ascii_letters + string.digits, random.randint(4, 14)) 
    domain = rand_str(string.ascii_lowercase, random.randint(2, 10)) 
    kind = random.choice(_all_email_kinds)
    return "%s@%s%s" % (name, domain, kind)